Factors Affecting EM Induction Flashcards

All 6 cards in this deck

What four factors affect the size of an induced potential difference?

The speed of the relative movement, the number of turns on the coil, the strength of the magnetic field, and the area of the coil.

What two changes reverse the direction of an induced potential difference in a coil?

Reversing the direction of the movement, or reversing the poles of the magnet.

How does the magnetic field produced by an induced current relate to the original change?

It opposes the original change.
e.g. it repels a magnet being pushed in and attracts it as it is pulled out.

True or false? Moving a magnet into a coil more quickly increases the induced potential difference.

True. A faster rate of change of magnetic field gives a larger induced p.d.

True or false? The magnetic field made by an induced current acts in a direction that helps the movement causing it.

False. It always opposes the change that produced it, so work must be done to keep the movement going.

True or false? Using a coil with more turns gives a larger induced potential difference.

True. More turns means a larger induced p.d. for the same movement.