Q.
A conducting wire frame is placed in a magnetic field, which is directed into the paper, figure. The magnetic field is increasing at a constant rate. The directions of induced current in wires $AB\ and\ CD$ are
A) $A\ to\ B\ and\ C\ to\ D$
B) $B\ to\ A\ and\ C\ to\ D$
C) $A\ to\ B\ and\ D\ to\ C$
D) $B\ to\ A\ and\ D\ to\ C$
Explanation
(d) As the magnetic field directed into the paper is increasing at a constant rate, therefore, induced current should produce a magnetic field directed out of the paper. Thus current in both the loops must be anti-clock-wise.
[image:7_image50.emf]
As area of loop on right side is more, therefore, induced emf o right side of loop will be more compared to the emf induced on the left-side of the loop
$\left\lbrack \therefore e = \ - \frac{d\phi}{dt} = - A\frac{dB}{dt} \right\rbrack$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.