P15 Electromagnetism Combined H

What happens when two magnets with the same poles are brought close together?

• They attract each other.

• They repel each other.

• They have no effect on each other.

• They lose their magnetism.

What is a permanent magnet?

• An object that becomes magnetic when placed in a magnetic field.

• An object that produces its own magnetic field which is always there.

• An object that loses its magnetism quickly.

• An object that can only be magnetized temporarily.

What is the shape of the magnetic field around a straight wire carrying current?

• Parallel lines.

• Concentric circles.

• Random lines.

• Zigzag lines.

What is a solenoid?

• A cylindrical coil of wire.

• A flat sheet of metal.

• A spherical magnet.

• A rectangular block of iron.

What is the main advantage of an electromagnet over a permanent magnet?

• It is always magnetic.

• It can be turned on and off.

• It is stronger than a permanent magnet.

• It is lighter than a permanent magnet.

What is the direction of the magnetic field lines around a bar magnet?

• From the south pole to the north pole.

• From the north pole to the south pole.

• In random directions.

• In a circular motion around the magnet.

What happens to the magnetic field strength when the current through a wire is increased?

• It decreases.

• It remains the same.

• It increases.

• It disappears.

What happens when a current-carrying wire is placed in a magnetic field?

• It experiences a force.

• It loses its current.

• It generates heat.

• It becomes an insulator.

According to Fleming's left-hand rule, what does the thumb represent?

• Current

• Magnetic field

• Force/motion

• Voltage

What is the measure of the strength of a magnetic field called?

• Magnetic flux density

• Magnetic force

• Magnetic current

• Magnetic length