Electromagnetic Induction with Solenoids · PhysicsBowl 2007 #34
Physics · electromagnetism
Problem
For the solenoids shown in the diagram (which are assumed to be close to each other), the resistance of the left-hand circuit is slowly increased. In which direction does the galvanometer needle in the right-hand circuit move in response to this change?
[Figure: Two solenoid circuits with galvanometer]
(a) The needle deflects to the left.
(b) The needle deflects to the right.
(c) The needle oscillates back and forth.
(d) The needle rotates in counterclockwise circles.
(e) The needle never moves.