Two coils,1 and 2,with iron cores are positioned as shown in the figure.Coil 1 is part of a circuit with a battery and a switch.

-Assume that S has been closed for a long time.Which one of the following changes will not result in an induced current in coil 2 that flows from left to right through R.
A)Coil 1 and its core are moved toward A.
B)Coil 2 and its core are moved toward B.
C)Coil 2 and its core are moved toward C.
D)The switch S is opened.
E)The iron core is removed from coil 1.

Question

Two coils,1 and 2,with iron cores are positioned as shown in the figure.Coil 1 is part of a circuit with a battery and a switch.
 
-Assume that S has been closed for a long time.Which one of the following changes will not result in an induced current in coil 2 that flows from left to right through R.
A)Coil 1 and its core are moved toward A. 
B)Coil 2 and its core are moved toward B. 
C)Coil 2 and its core are moved toward C. 
D)The switch S is opened. 
E)The iron core is removed from coil 1.

Quizplus · Accepted Answer

Moving coil 2 and its core toward B does not change the magnetic flux through coil 2 because it is moving parallel to the magnetic field lines, not altering the amount of magnetic field lines passing through it.

Two Coils,1 and 2,with Iron Cores Are Positioned as Shown