Electromagnetism Flashcards
1
Q
State Faraday’s law of electromagnetic induction
A
The induced e.m.f is directly proportional to the rate of change of magnetic flux linkage
2
Q
A magnet is moving into the centre of a flat circular coil of wire. A current is induced in the coil. Use ideas about energy conservation to state and explain the polarity of the face of the coil nearer the magnet
A
North Pole, there is a repulsive force between the magnet and coil and the work done against this repulsive force is transferred to electrical energy in the coil.
3
Q
State Lena’s law
A
The direction of any induced e.m.f or current is in a direction that opposes the flux change that causes it.
