The direction of the current induced in a conductor by a changing is such that the magnetic field created by the induced current the initial changing magnetic field.
The diagram shows a permanent magnet being moved through a loop of copper wire. This motion induces an electric current of 0.5 A in the wire.
If the magnet is moved through the loop at half the speed, what will the current in the loop be?
If the permanent magnet is changed for one that is twice as strong and moves through the loop at the original speed, what will the current in the loop be?
Diagram (a) shows a straight piece of copper wire moving along a rectangular path in a uniform magnetic field. Diagram (b) shows the potential difference across the piece of wire against time as it does so. Position in diagram a corresponds to the section marked in diagram (b).
Which section of diagram (b) does position in diagram (a) correspond to?
Which position in diagram (a) does section in diagram (b) correspond to?