P15 Electromagnetism (Triple)

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.

• A magnet that produces its own magnetic field which is always there.

• A magnet that loses its magnetism quickly.

• A magnet that only works when near another magnet.

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

• Square

• Concentric circles

• Triangular

• Random lines

What is a solenoid?

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What happens to the magnetic field strength when a current-carrying wire is bent into a solenoid?

• It decreases.

• It remains the same.

• It increases.

• It disappears.

What is one advantage of electromagnets?

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

• It experiences a force.

• It becomes an electromagnet.

• It loses its current.

• It generates sound waves.

What is the purpose of the split-ring commutator in an electric motor?

• To keep the motor spinning in the same direction.

• To increase the current in the coil.

• To decrease the magnetic field strength.

• To generate sound waves.

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

• Direction of the current.

• Direction of the magnetic field.

• Direction of the force/motion.

• Direction of the voltage.

What is the equation to calculate the force on a wire?

• F = BIl

• F = mgh

• F = qE

• F = ma