The magnet in fig. rotates as shown on a pivot through its center. At the instant shown, what are directions of the induced currents

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

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

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

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

answer is A.

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Detailed Solution

$N$ pole moves closer to coil $C D$ and $S$ pole moves closer to coil $A B$ on rotation of magnet.

According to Lenz's law, $N$ pole should develop at the end corresponding to $C$ .

$∴$ Induced current flows from $C$ to $D$

Also $S$ pole should develop at the end corresponding to $B$

$∴$ Induced current flows from $A$ to $B$ .

Therefore the answer is (1)

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