Electromagnetism MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Electromagnetism MCQs for Preparation.

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## Electromagnetism Online MCQs with Answers

An electric current is a flow of:
(a) Electrons
(b) Protons
(c) Neutrons
(d) Positrons

(a) Electrons

The SI unit of electric current is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb

(b) Ampere

The force experienced by a charged particle moving in a magnetic field is called:
(a) Electric force
(b) Magnetic force
(c) Gravitational force
(d) Electromagnetic force

(b) Magnetic force

The direction of the magnetic field lines around a current-carrying wire can be determined using:
(a) Right-hand rule
(b) Left-hand rule
(c) Middle finger rule
(d) Index finger rule

(a) Right-hand rule

The strength of the magnetic field around a current-carrying wire depends on:
(a) Current in the wire
(b) Length of the wire
(c) Resistance of the wire
(d) Voltage across the wire

(a) Current in the wire

A wire carrying an electric current produces a magnetic field. This is known as:
(a) Ampere’s law
(c) Lenz’s law
(d) Biot-Savart law

(d) Biot-Savart law

The magnetic field inside a solenoid is:
(a) Zero
(b) Uniform
(c) Stronger at the ends
(d) Weaker at the ends

(b) Uniform

The phenomenon of electromagnetic induction is associated with:
(a) Electric current
(b) Magnetic field
(c) Resistance
(d) Voltage

(d) Voltage

Faraday’s law of electromagnetic induction states that:
(a) The induced voltage is directly proportional to the current
(b) The induced voltage is inversely proportional to the resistance
(c) The induced voltage is directly proportional to the magnetic field strength
(d) The induced voltage is proportional to the rate of change of magnetic flux

(d) The induced voltage is proportional to the rate of change of magnetic flux

The phenomenon of self-induction occurs in a:
(a) Resistor
(b) Capacitor
(c) Transformer
(d) Inductor

(d) Inductor

In an AC circuit, the direction of current:
(a) Reverses periodically
(b) Remains constant
(c) Increases linearly
(d) Decreases linearly

(a) Reverses periodically

The unit of electrical power is the:
(a) Watt
(b) Volt
(c) Ampere
(d) Ohm

(a) Watt

The relationship between current, voltage, and resistance is given by:
(a) Ohm’s law
(b) Newton’s law
(c) Coulomb’s law

(a) Ohm’s law

In a parallel circuit, the total resistance is:
(a) Equal to the sum of individual resistances
(b) Less than the smallest resistance
(c) Greater than the largest resistance
(d) Equal to the average of individual resistances

(b) Less than the smallest resistance

The energy stored in a capacitor is given by the equation:
(a) E = mc²
(b) E = ½mv²
(c) E = ½kx²
(d) E = ½CV²

(d) E = ½CV²

An electric motor converts:
(a) Electrical energy into mechanical energy
(b) Mechanical energy into electrical energy
(c) Heat energy into electrical energy
(d) Heat energy into mechanical energy

(a) Electrical energy into mechanical energy

A step-up transformer is used to:
(a) Increase voltage
(b) Increase current
(c) Decrease voltage
(d) Decrease current

(a) Increase voltage

The direction of an induced current in a coil can be determined by:
(a) Lenz’s law
(c) Ohm’s law
(d) Ampere’s law

(a) Lenz’s law

The speed of light in a vacuum is approximately:
(a) 300 m/s
(b) 3,000 m/s
(c) 30,000 m/s
(d) 300,000,000 m/s

(d) 300,000,000 m/s

The electromagnetic spectrum includes:
(a) Radio waves, microwaves, and X-rays
(b) Radio waves, infrared, and ultraviolet
(c) Infrared, visible light, and X-rays
(d) Ultraviolet, X-rays, and gamma rays

(b) Radio waves, infrared, and ultraviolet

Which of the following materials is a good conductor of electricity?
(a) Wood
(b) Rubber
(c) Copper
(d) Glass

(c) Copper

The process of transferring charge by direct contact is called:
(a) Induction
(b) Conduction
(c) Insulation
(d) Polarization

(b) Conduction

A magnetic field is produced by:
(a) Stationary charges
(b) Moving charges
(c) Both stationary and moving charges
(d) Electric fields

(b) Moving charges

The force between two charged objects is strongest when:
(a) They have opposite charges
(b) They have the same charge
(c) They are far apart
(d) They are neutral

(a) They have opposite charges

The electric field lines around a positive charge:
(b) Point inwards
(c) Are circular
(d) Are straight lines

An object becomes negatively charged when:
(a) Electrons are added to it
(b) Electrons are removed from it
(c) Protons are added to it
(d) Protons are removed from it

(b) Electrons are removed from it

The process of charging a neutral object by bringing it close to a charged object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization

(b) Induction

An electric field exerts a force on a charged object in the direction:
(a) Opposite to the electric field
(b) Parallel to the electric field
(c) Perpendicular to the electric field
(d) Inward towards the source of the field

(b) Parallel to the electric field

Coulomb’s law describes the force between:
(a) Electric and magnetic fields
(b) Electric charges
(c) Magnetic poles

(b) Electric charges

The relationship between electric current, voltage, and resistance is described by:
(a) Ampere’s law
(b) Ohm’s law
(d) Coulomb’s law

(b) Ohm’s law

An electromagnetic wave consists of:
(a) Electric field only
(b) Magnetic field only
(c) Electric and magnetic fields oscillating perpendicular to each other
(d) Electric and magnetic fields oscillating in the same direction

(c) Electric and magnetic fields oscillating perpendicular to each other

The phenomenon of refraction is associated with:
(a) Light waves
(b) Sound waves
(c) Electromagnetic waves
(d) X-rays

(a) Light waves

The ability of a material to conduct electricity is measured by its:
(a) Conductance
(b) Resistance
(c) Capacitance
(d) Inductance

(a) Conductance

An insulator is a material that:
(a) Conducts electricity well
(b) Resists the flow of electric current
(c) Changes its resistance with temperature
(d) Stores electrical energy

(b) Resists the flow of electric current

The unit of electric charge is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb

(d) Coulomb

The force between two point charges is directly proportional to:
(a) The product of their charges
(b) The square of the distance between them
(c) The square root of the distance between them
(d) The cube of the distance between them

(a) The product of their charges

The process of storing electrical energy in a capacitor is called:
(a) Charging
(b) Discharging
(c) Polarizing
(d) Inducting

(a) Charging

An electric field is produced by a:
(a) Moving charge
(b) Stationary charge
(c) Magnet
(d) Conductor

(b) Stationary charge

The unit of electric potential difference is the:
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb

(a) Volt

A device that converts mechanical energy into electrical energy is called a:
(a) Generator
(b) Motor
(c) Resistor
(d) Capacitor

(a) Generator

The property of a material that opposes the flow of electric current is called:
(a) Conductance
(b) Resistance
(c) Capacitance
(d) Inductance

(b) Resistance

The process of separating positive and negative charges in an object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization

(d) Polarization

The strength of the magnetic field around a current-carrying wire is increased by:
(a) Increasing the current
(b) Decreasing the current
(c) Increasing the resistance
(d) Decreasing the resistance

(a) Increasing the current

The unit of magnetic field strength is the:
(a) Tesla
(b) Ampere
(c) Ohm
(d) Coulomb

(a) Tesla

The direction of the magnetic field inside a solenoid can be determined using:
(a) Right-hand rule
(b) Left-hand rule
(c) Middle finger rule
(d) Index finger rule

(a) Right-hand rule

The process of generating an electric current by moving a magnet inside a coil of wire is called:
(a) Induction
(b) Conduction
(c) Resistance
(d) Capacitance

(a) Induction

The electromagnetic wave with the longest wavelength is:
(b) Microwaves
(c) Infrared
(d) Ultraviolet

The color of light with the highest frequency is:
(a) Red
(b) Green
(c) Blue
(d) Yellow

(c) Blue

The electromagnetic wave with the shortest wavelength is:
(b) Microwaves
(c) Infrared
(d) Gamma rays

(d) Gamma rays

An electrically charged object will experience a force when placed in a:
(a) Magnetic field
(b) Electric field
(c) Gravitational field
(d) None of the above

(b) Electric field

The process of charging a neutral object by bringing it in contact with a charged object is called:
(a) Induction
(b) Conduction
(c) Discharge
(d) Polarization

(b) Conduction

The direction of the induced current in a coil can be determined by:
(a) Lenz’s law
(c) Ohm’s law
(d) Ampere’s law

(a) Lenz’s law

The strength of the magnetic field inside an electromagnet can be increased by:
(a) Increasing the current
(b) Decreasing the current
(c) Increasing the number of turns in the coil
(d) Decreasing the number of turns in the coil

(c) Increasing the number of turns in the coil

The process of transferring charge from a charged object to the ground is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization

(c) Discharge

The phenomenon of electromagnetic induction is associated with:
(a) Electric current
(b) Magnetic field
(c) Resistance
(d) Voltage

(d) Voltage

The energy stored in a capacitor is given by the equation:
(a) E = mc²
(b) E = ½mv²
(c) E = ½kx²
(d) E = ½CV²

(d) E = ½CV²

A step-down transformer is used to:
(a) Increase voltage
(b) Increase current
(c) Decrease voltage
(d) Decrease current

(c) Decrease voltage

The direction of an induced current in a coil can be determined by:
(a) Lenz’s law
(c) Ohm’s law
(d) Ampere’s law

(a) Lenz’s law

The speed of light in a vacuum is approximately:
(a) 300 m/s
(b) 3,000 m/s
(c) 30,000 m/s
(d) 300,000,000 m/s

(d) 300,000,000 m/s

The electromagnetic spectrum includes:
(a) Radio waves, microwaves, and X-rays
(b) Radio waves, infrared, and ultraviolet
(c) Infrared, visible light, and X-rays
(d) Ultraviolet, X-rays, and gamma rays

(b) Radio waves, infrared, and ultraviolet

Which of the following materials is a good conductor of electricity?
(a) Wood
(b) Rubber
(c) Copper
(d) Glass

(c) Copper

The process of transferring charge by direct contact is called:
(a) Induction
(b) Conduction
(c) Insulation
(d) Polarization

(b) Conduction

A magnetic field is produced by:
(a) Stationary charges
(b) Moving charges
(c) Both stationary and moving charges
(d) Electric fields

(b) Moving charges

The force between two charged objects is strongest when:
(a) They have opposite charges
(b) They have the same charge
(c) They are far apart
(d) They are neutral

(a) They have opposite charges

The electric field lines around a positive charge:
(b) Point inwards
(c) Are circular
(d) Are straight lines

An object becomes negatively charged when:
(a) Electrons are added to it
(b) Electrons are removed from it
(c) Protons are added to it
(d) Protons are removed from it

(a) Electrons are added to it

The process of charging a neutral object by bringing it close to a charged object is called:
(a) Conduction
(b) Induction
(c) Discharge
(d) Polarization

(b) Induction

An electric field exerts a force on a charged object in the direction:
(a) Opposite to the electric field
(b) Parallel to the electric field
(c) Perpendicular to the electric field
(d) Inward towards the source of the field

(c) Perpendicular to the electric field

Coulomb’s law describes the force between:
(a) Electric and magnetic fields
(b) Electric charges
(c) Magnetic poles
(d) Electromagnetic waves