Question

Which of the statements below describes how a motor operates? A motor works by changing the magnetic flux to change the voltage of a circuit.⊝A motor works by electrical energy moving a charge through a loop in a magnetic field, causing the loop to rotate.⊝A motor works by rotating a magnet in order to generate electricity.⊝A motor works by using physical work to push a charge through a loop, generating a uniform magnetic field.

Answer 1

Operation of a motor:

A motor takes electrical energy as input which energizes the windings of the motor and a changing magnetic field is generated which in turn generates force in the form of torque.

Let us have a look at the given options:

Option 1:

A motor works by changing the magnetic flux to change the voltage of a circuit.

This is incorrect.

Option 2:

A motor works by electrical energy moving a charge through a loop in a magnetic field, causing the loop to rotate.

This is the correct statement, this is how a motor operates.

Option 3:

A motor works by rotating a magnet in order to generate electricity.

This is incorrect since a motor consumes electricity (it does not generate electricity)

Option 4:

A motor works by using physical work to push a charge through a loop, generating a uniform magnetic field.

This is incorrect since a motor does not physical work to operate.

Therefore, the only correct statement is option 2