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Question

In the following circuit the potential difference between the points B and C is balanced against 40 cm length of potentiometer wire. In order to balance the potential difference between the points C and D, where should jockey be pressed

A
32 cm
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B
16 cm
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C
8 cm
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D
4 cm
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Solution

The correct option is A 32 cm
1R=110+110=210=15 or R1=5Ω
R2=4Ω,I1=40 cm,I2=?
l2=l1R2R1 or l2=40×45=32 cm

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