The Motor Effect _ GCSE Physics

The video tutorial explains the motor effect, where a current-carrying wire in a magnetic field experiences a force. Fleming's left-hand rule helps determine the force's direction. A simple electric motor uses this principle, with a coil of wire in a magnetic field causing rotation. The motor's speed can be increased by boosting the current or using a stronger magnetic field.

What happens when a current flows through a wire in a magnetic field?

• It generates an electric charge.

• It causes the wire to heat up.

• It produces a magnetic field.

• It creates a gravitational field.

Which rule helps determine the direction of force in the motor effect?

• Fleming's Left-Hand Rule

• Faraday's Law

• Ohm's Law

• Newton's Third Law

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

• Direction of the force

• Direction of the current

• Direction of the magnetic field

• Direction of the voltage

What component in an electric motor swaps the contacts every half turn?

• Brushes

• Split ring commutator

• Armature

• Rotor

How can the speed of an electric motor be increased?

• By reducing the number of coils

• By increasing the current or using a stronger magnetic field

• By using a weaker magnetic field

• By decreasing the current