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Question

In a meter bridge experiment, null point is obtained at 40cm from left end when unknown resistance is inserted in left gap and a resistance of 60 Ω is inserted in the right gap. If resistance of 60Ω is kept same, but the wire in left gap is cut in two equal parts, and joined in parallel across the left gap, the new null point is at

A
40 cm from left end
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B
20 cm from left end
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C
10 cm from left end
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D
100/7 cm from left end
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Solution

The correct option is C 100/7 cm from left end
x60=40cm10040cm x=40Ω

1060=I100I

I=1007cm

1123897_992837_ans_716b6a5019c74cfd993788a324fc6fd2.JPG

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