A conducting wire frame is placed in a magnet | vedclass

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(A) The magnetic field is directed into the paper and is increasing with time. According to Lenz's Law,the induced current will create a magnetic fiel

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$B$ to $A$ and $D$ to $C$

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(A) The magnetic field is directed into the paper and is increasing with time. According to Lenz's Law,the induced current will create a magnetic field that opposes this increase,meaning the induced magnetic field must be directed out of the paper. For the left loop,the induced current must be anticlockwise,which means the current flows from $B$ to $A$. For the right loop,the induced current must also be anticlockwise,which means the current flows from $D$ to $C$. Since the area of the right loop is larger than the left loop,the induced emf $\left( e = - \frac{d\phi}{dt} = - A \frac{dB}{dt} \right)$ is greater in the right loop. Thus,the net current in the entire circuit follows the direction dictated by the larger loop,resulting in current from $B$ to $A$ in wire $AB$ and from $D$ to $C$ in wire $CD$.

$A$ conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires $AB$ and $CD$ are

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