Electro-Magnetism Quiz

What does Oersted's experiment suggest about a current-carrying wire?

• It emits light.

• It produces a sound wave.

• It produces a magnetic field around it.

• It generates heat.

What shape do the magnetic field lines form around a straight conductor?

• Ellipses

• Concentric circles

• Straight lines

• Spirals

What happens to the compass needle when the direction of current is reversed?

• It stops moving.

• It moves faster.

• The direction of deflection gets reversed.

• It changes color.

What rule is used to find the direction of the magnetic field?

• Fleming's rule

• Right-hand thumb rule

• Ampere's rule

• Left-hand rule

What happens to the magnetic field lines when the current in the wire is increased?

• They become less dense.

• They disappear.

• They change direction.

• They become denser.

What is the effect of increasing the number of turns in a loop on the magnetic field?

• It increases the magnetic field strength.

• It reverses the magnetic field.

• It has no effect.

• It decreases the magnetic field strength.

What does one face of a current-carrying loop act as?

• An insulator

• A neutral point

• A north pole

• A south pole

What is a solenoid?

• A coil of wire

• A type of magnet

• A type of battery

• A type of transformer

What happens to the magnetic field lines inside a solenoid?

• They form loops.

• They are circular.

• They are nearly straight and parallel.

• They are chaotic.

What is the main difference between a current-carrying solenoid and a bar magnet?

• A solenoid cannot attract iron.

• A solenoid is always stronger.

• A solenoid has a fixed magnetic field.

• A solenoid can be turned off.