Lenz's Law, Eddy Currents & Induced Electric Field
Figure shows the north pole of a magnet moving away from a thick conducting loop containing a capacitor. The excess positive charge will arrive on
Show answer and solution
Answer: (b)
- The field of the N pole at the loop points away from the magnet (to the left), and this flux decreases as the magnet moves away.
- Lenz's law: the induced current must make a leftward field inside the loop.
- Seen from the magnet's side, this current is clockwise: it flows down the right-hand side of the loop towards plate .
- So positive charge collects on plate , answer (b).