Question

A square loop is placed near a long straight current carrying wire as shown. Match the following two columns

Answer 1

(A) i-increases

${\varphi }_s$-Flux in the loop ABCD increases into the plane of paper.

using Lenz's law,

current induced Anti-clockwise,

$I_{AD}$ Anti $\parallel$ and $I_{BC}\parallel i$

no force due to side AB and CD

$y>x$

loop repel.

(B) i- decreases

${\varphi }_s$- decreases into the plane of paper induced current clockwise

$I_{AD}$ $\parallel i$ and $I_{BC}$ anti \parallel i$

wire attract the loop.

(C) ${\varphi }_s$ -Flux in the loop decreases similar to (B)

(D)$\varphi$ -Flux increases similar to (A).