GCSE Physics - Generator Effect / Electromagnetic Induction #81

The video explains electromagnetic induction, where a potential difference is induced in a wire moving through a magnetic field. It highlights that a current is generated when the wire forms a closed circuit. The video also discusses how the strength of the magnetic field, speed of movement, and number of coil turns affect the induced potential difference. Additionally, it covers how moving a magnet in and out of a coil induces a current, with direction changes based on magnet orientation.

What is necessary for a potential difference to be induced in a wire?

• A stationary wire in a magnetic field

• A wire with a constant magnetic field

• A change in the magnetic field experienced by the wire

• A wire with no magnetic field

What happens to the potential difference when the wire stops moving?

• It remains constant

• It increases

• It reverses direction

• It disappears

How can a current be generated in a wire with an induced potential difference?

• By keeping the wire open-ended

• By decreasing the magnetic field strength

• By connecting the wire ends to form a closed circuit

• By increasing the wire's length

Which of the following will NOT increase the induced potential difference?

• Increasing the speed of movement

• Moving the wire or magnets more slowly

• Adding more turns to the coil

• Using stronger magnets

What effect does changing the direction of a magnet have on the induced current?

• It decreases the current

• It increases the current

• It has no effect

• It changes the direction of the current