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Q.

AB is the wire of a potentiometer with the increase in the value of the resistance R, the shift in the balance point J will be 
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a

Towards A

b

Towards B

c

Constant ( no shift )

d

First towards B and then back towards A

answer is B.

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Detailed Solution

As R increases, current through the wire decreases and potential gradient decreases. This results in increase in balancing length. So J will shift towards B

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