# Magnetic Fields and Forces MCQs with Answers

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## Magnetic Fields and Forces Online MCQs with Answers

What is the SI unit of magnetic field?
a) Tesla
b) Ampere
c) Volt
d) Ohm

a) Tesla

A magnetic field is produced by:
a) Moving electric charges
b) Stationary electric charges
c) Both moving and stationary electric charges
d) None of the above

a) Moving electric charges

The direction of the magnetic field around a straight current-carrying wire is:
a) Clockwise
b) Counterclockwise
d) It depends on the direction of current

b) Counterclockwise

The direction of the magnetic field inside a solenoid is:
a) Clockwise
b) Counterclockwise
d) Uniform

d) Uniform

The magnetic field inside a solenoid can be increased by:
a) Increasing the current through the solenoid
b) Increasing the number of turns in the solenoid
c) Increasing the length of the solenoid
d) All of the above

d) All of the above

The force experienced by a charged particle moving in a magnetic field depends on:
a) The charge of the particle
b) The velocity of the particle
c) The strength of the magnetic field
d) All of the above

d) All of the above

The force experienced by a charged particle moving perpendicular to a magnetic field is:
a) Maximum
b) Minimum
c) Zero
d) It depends on the velocity of the particle

c) Zero

The force experienced by a charged particle moving parallel to a magnetic field is:
a) Maximum
b) Minimum
c) Zero
d) It depends on the charge of the particle

c) Zero

The force experienced by a charged particle moving at an angle to a magnetic field is:
a) Maximum when the angle is 0°
b) Maximum when the angle is 90°
c) Minimum when the angle is 0°
d) Minimum when the angle is 90°

b) Maximum when the angle is 90°

The magnitude of the magnetic force experienced by a charged particle moving in a magnetic field is given by:
a) F = Bv
b) F = qvB
c) F = q/B
d) F = qv/B

b) F = qvB

The direction of the magnetic force experienced by a charged particle moving in a magnetic field is given by:
a) The right-hand rule
b) The left-hand rule
c) The direction of the velocity
d) The direction of the magnetic field

a) The right-hand rule

The magnetic force on a current-carrying wire is:
a) Attractive
b) Repulsive
c) Zero
d) It depends on the direction of the current

c) Zero

The magnitude of the magnetic force on a current-carrying wire is given by:
a) F = BIL
b) F = B/L
c) F = Bv
d) F = qvB

a) F = BIL

The direction of the magnetic force on a current-carrying wire is given by:
a) The right-hand rule
b) The left-hand rule
c) The direction of the current
d) The direction of the magnetic field

a) The right-hand rule

The torque experienced by a current loop in a magnetic field depends on:
a) The magnitude of the magnetic field
b) The area of the loop
c) The orientation of the loop with respect to the magnetic field
d) All of the above

d) All of the above

The magnitude of the torque experienced by a current loop in a magnetic field is given by:
a) τ = BIA
b) τ = B/A
c) τ = BIL
d) τ = Bv

c) τ = BIL

The direction of the torque experienced by a current loop in a magnetic field is given by:
a) The right-hand rule
b) The left-hand rule
c) The direction of the current
d) The direction of the magnetic field

a) The right-hand rule

A magnetic field exerts a force on a moving charged particle, but it does not change the particle’s:
a) Mass
b) Speed
c) Momentum
d) Kinetic energy

a) Mass

A charged particle moving in a magnetic field follows a:
a) Straight line path
b) Circular path
c) Elliptical path
d) Parabolic path

b) Circular path

The radius of the circular path followed by a charged particle in a magnetic field depends on:
a) The charge of the particle
b) The velocity of the particle
c) The strength of the magnetic field
d) All of the above

d) All of the above

The magnetic field inside a current-carrying loop is:
a) Zero
b) Maximum
c) Inversely proportional to the current
d) Directly proportional to the current

b) Maximum

The magnetic field outside a current-carrying loop is:
a) Zero
b) Maximum
c) Inversely proportional to the current
d) Directly proportional to the current

c) Inversely proportional to the current

The strength of the magnetic field produced by a current-carrying wire depends on:
a) The current in the wire
b) The distance from the wire
c) The material surrounding the wire
d) All of the above

a) The current in the wire

The magnetic field inside a current-carrying solenoid is:
a) Zero
b) Maximum
c) Inversely proportional to the current
d) Directly proportional to the current

b) Maximum

The magnetic field outside a current-carrying solenoid is:
a) Zero
b) Maximum
c) Inversely proportional to the current
d) Directly proportional to the current

c) Inversely proportional to the current

A magnetic field can exert a force on a:
a) Charged particle
b) Neutral particle
c) Both charged and neutral particles
d) None of the above

a) Charged particle

The Earth’s magnetic field is similar to that of:
a) A bar magnet
b) A solenoid
c) A current-carrying wire
d) An electromagnet

a) A bar magnet

The Earth’s magnetic field is generated by:
a) The rotation of the Earth’s core
b) The movement of molten iron in the Earth’s outer core
c) The Earth’s magnetic field is not generated by any known mechanism
d) The interaction between the Earth’s core and the Sun’s magnetic field

b) The movement of molten iron in the Earth’s outer core

The Earth’s magnetic field is approximately:
a) Vertical at the North Pole and horizontal at the equator
b) Vertical at the equator and horizontal at the North Pole
c) Vertical at both the North Pole and the equator
d) Horizontal at both the North Pole and the equator

a) Vertical at the North Pole and horizontal at the equator

The region around a magnet where its magnetic influence is felt is called:
a) Magnetic field
b) Magnetic domain
c) Magnetic pole
d) Magnetic flux

a) Magnetic field

Magnetic field lines:
a) Are straight lines
b) Are circular lines
c) Never cross each other
d) All of the above

c) Never cross each other

The magnetic field inside a magnet is:
a) Zero
b) Uniform
c) Varies from point to point
d) Depends on the strength of the magnet

b) Uniform

The magnetic field outside a magnet:
a) Zero
b) Uniform
c) Varies from point to point
d) Depends on the strength of the magnet

c) Varies from point to point

The north pole of a magnet:
a) Attracts the north pole of another magnet
b) Repels the north pole of another magnet
c) Attracts the south pole of another magnet
d) Repels the south pole of another magnet

b) Repels the north pole of another magnet

The south pole of a magnet:
a) Attracts the north pole of another magnet
b) Repels the north pole of another magnet
c) Attracts the south pole of another magnet
d) Repels the south pole of another magnet

c) Attracts the south pole of another magnet

The magnetic field inside a current-carrying loop is:
a) Directed away from the loop
b) Directed towards the loop
c) Zero
d) Depends on the direction of the current

a) Directed away from the loop

The magnetic field outside a current-carrying loop is:
a) Directed away from the loop
b) Directed towards the loop
c) Zero
d) Depends on the direction of the current

c) Zero

The magnetic field inside a current-carrying coil is:
a) Directed away from the coil
b) Directed towards the coil
c) Zero
d) Depends on the direction of the current

b) Directed towards the coil

The magnetic field outside a current-carrying coil is:
a) Directed away from the coil
b) Directed towards the coil
c) Zero
d) Depends on the direction of the current

c) Zero

A magnetic field can exert a torque on a:
a) Charged particle
b) Neutral particle
c) Both charged and neutral particles
d) None of the above

c) Both charged and neutral particles

The strength of the magnetic field produced by a current-carrying wire depends on:
a) The current in the wire
b) The distance from the wire
c) The material surrounding the wire
d) All of the above

a) The current in the wire

The strength of the magnetic field produced by a solenoid depends on:
a) The current in the solenoid
b) The number of turns in the solenoid
c) The length of the solenoid
d) All of the above

d) All of the above

The direction of the magnetic field inside a solenoid is:
a) Clockwise
b) Counterclockwise
d) Uniform

d) Uniform

The strength of the magnetic field inside a solenoid can be increased by:
a) Increasing the current through the solenoid
b) Increasing the number of turns in the solenoid
c) Increasing the length of the solenoid
d) All of the above

d) All of the above

The magnetic field produced by a solenoid is similar to that produced by:
a) A bar magnet
b) A current-carrying wire
c) An electromagnet
d) A horseshoe magnet

a) A bar magnet

The force experienced by a current-carrying wire in a magnetic field depends on:
a) The current in the wire
b) The length of the wire
c) The strength of the magnetic field
d) All of the above

d) All of the above

The direction of the force experienced by a current-carrying wire in a magnetic field is given by:
a) The right-hand rule
b) The left-hand rule
c) The direction of the current
d) The direction of the magnetic field

a) The right-hand rule

The force experienced by a current-carrying wire in a magnetic field can be increased by:
a) Increasing the current in the wire
b) Increasing the length of the wire
c) Increasing the strength of the magnetic field
d) All of the above

d) All of the above

The force experienced by a current-carrying wire in a magnetic field is maximum when:
a) The wire is perpendicular to the magnetic field
b) The wire is parallel to the magnetic field
c) The wire makes an angle of 45° with the magnetic field
d) The force is always zero for a current-carrying wire

a) The wire is perpendicular to the magnetic field

A moving charged particle in a magnetic field experiences a force that is:
a) Always perpendicular to its velocity
b) Always parallel to its velocity
c) Always in the direction of its velocity
d) It depends on the charge of the particle

a) Always perpendicular to its velocity

The magnitude of the force experienced by a moving charged particle in a magnetic field is given by:
a) F = qvB
b) F = q/B
c) F = Bv
d) F = qv/B

a) F = qvB

The direction of the force experienced by a moving charged particle in a magnetic field is given by:
a) The right-hand rule
b) The left-hand rule
c) The direction of the velocity
d) The direction of the magnetic field

a) The right-hand rule

A charged particle moving parallel to a magnetic field experiences:
a) A force that is perpendicular to its velocity
b) A force that is parallel to its velocity
c) No force
d) It depends on the charge of the particle

c) No force

A charged particle moving perpendicular to a magnetic field experiences:
a) A force that is perpendicular to its velocity
b) A force that is parallel to its velocity
c) No force
d) It depends on the charge of the particle

a) A force that is perpendicular to its velocity

The force experienced by a charged particle moving in a magnetic field can cause it to:
a) Change direction
b) Change speed
c) Change both direction and speed
d) The force cannot cause any change in the particle’s motion

a) Change direction

The magnetic force on a current-carrying wire can cause it to:
a) Move in the direction of the force
b) Move in the opposite direction of the force
d) The force cannot cause any change in the wire’s motion

The magnetic force on a charged particle moving in a circular path in a magnetic field is:
a) Centripetal
b) Tangential
c) Zero
d) It depends on the charge of the particle

a) Centripetal

The magnetic force on a charged particle moving in a helical path in a magnetic field is:
a) Centripetal
b) Tangential
c) Zero
d) It depends on the charge of the particle

b) Tangential

The Hall effect is the phenomenon of:
a) The generation of a voltage across a conductor perpendicular to both the current and the magnetic field
b) The generation of a current across a conductor perpendicular to both the voltage and the magnetic field
c) The generation of a magnetic field across a conductor perpendicular to both the current and the voltage
d) The generation of a current across a conductor parallel to both the current and the magnetic field

a) The generation of a voltage across a conductor perpendicular to both the current and the magnetic field

The Hall effect is used to measure:
a) The magnetic field strength
b) The current through a conductor
c) The voltage across a conductor
d) The conductivity of a material

a) The magnetic field strength

Magnetic materials can be:
a) Ferromagnetic
b) Paramagnetic
c) Diamagnetic
d) All of the above

d) All of the above

In a ferromagnetic material, the domains:
a) Are randomly oriented
b) Are aligned parallel to each other
c) Are aligned anti-parallel to each other
d) Do not exist

b) Are aligned parallel to each other

A magnetic field can be shielded by:
a) A conductor
b) A diamagnetic material
c) A ferromagnetic material
d) All of the above

d) All of the above

Magnetic shielding is used to:
a) Protect sensitive equipment from magnetic interference
b) Confine magnetic fields to a specific region
c) Reduce the strength of magnetic fields
d) All of the above

d) All of the above

The magnetic field inside a diamagnetic material is:
a) Weaker than the applied field
b) Stronger than the applied field
c) Unaffected by the applied field
d) It depends on the temperature of the material

a) Weaker than the applied field

The magnetic field inside a paramagnetic material is:
a) Weaker than the applied field
b) Stronger than the applied field
c) Unaffected by the applied field
d) It depends on the temperature of the material

b) Stronger than the applied field

The magnetic field inside a ferromagnetic material is:
a) Weaker than the applied field
b) Stronger than the applied field
c) Unaffected by the applied field
d) It depends on the temperature of the material

b) Stronger than the applied field

Magnetic resonance imaging (MRI) is based on the phenomenon of:
a) Magnetic induction
b) Magnetic shielding
c) Magnetic resonance
d) Magnetic hysteresis

c) Magnetic resonance

The Earth’s magnetic field is used by:
b) Magnetometers for measuring the field strength
c) Compasses for finding direction
d) All of the above