The long straight wire in the figure carries a current I that is decreasing with time at a constant rate. The circular loops A, B, and C all lie in a plane containing the wire. The induced emf in each of the loops A, B, and C is such that
A) no emf is induced in any of the loops.
B) a counterclockwise emf is induced in all the loops.
C) loop A has a clockwise emf, loop B has no induced emf, and loop C has a counterclockwise emf.
D) loop A has a counter-clockwise emf, loop B has no induced emf, and loop C has a clockwise emf.
E) loop A has a counter-clockwise emf, loops B and C have clockwise emfs.

Question

The long straight wire in the figure carries a current I that is decreasing with time at a constant rate. The circular loops A, B, and C all lie in a plane containing the wire. The induced emf in each of the loops A, B, and C is such that 
A) no emf is induced in any of the loops. 
B) a counterclockwise emf is induced in all the loops. 
C) loop A has a clockwise emf, loop B has no induced emf, and loop C has a counterclockwise emf. 
D) loop A has a counter-clockwise emf, loop B has no induced emf, and loop C has a clockwise emf. 
E) loop A has a counter-clockwise emf, loops B and C have clockwise emfs.

Quizplus · Accepted Answer

The Answer of The long straight wire in the figure carries a current I that is decreasing with time at a constant rate. The circular loops A, B, and C all lie in a plane containing the wire. The induced emf in each of the loops A, B, and C is such that 
A) no emf is induced in any of the loops. 
B) a counterclockwise emf is induced in all the loops. 
C) loop A has a clockwise emf, loop B has no induced emf, and loop C has a counterclockwise emf. 
D) loop A has a counter-clockwise emf, loop B has no induced emf, and loop C has a clockwise emf. 
E) loop A has a counter-clockwise emf, loops B and C have clockwise emfs.

The Long Straight Wire in the Figure Carries a Current