A copper plate is free to swing between the poles of a largeelectromagnet. When

Question

A copper plate is free to swing between the poles of a largeelectromagnet. When the field is turned up the plate

A)will swing faster.
B)will brake and quickly come torest.
C)will become a permanent magnet.
D)will swing with a larger amplitude, becauseit is pushed by the magnet.
E)will not be affected at all.

A)will swing faster.
B)will brake and quickly come torest.
C)will become a permanent magnet.
D)will swing with a larger amplitude, becauseit is pushed by the magnet.
E)will not be affected at all.

Explanation / Answer

B) will brake and quickly come to rest. . This is because every time the plate swings through themagnetic field, a current is induced in the plate which opposes themagnetic field. The magnetic field will always apply a repulsiveforce to this current, regardless of the direction the plate moves.So the repulsive force on the induced current always acts to slowthe plate down... and eventually it will come to rest. (This is thesame as your other question, the aluminum disk on theelectromagnet).

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