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Questions  

In a meter bridge experiment, the ratio of left gap resistance to right gap resistance is 2:3 . The balance point from left is

a
20 cm
b
60 cm
c
50 cm
d
40 cm

detailed solution

Correct option is D

Resistance of left gap R=2 Ω Resistance of right gap S=3 Ω Balancing condition for meter bridge RS=l100−l 23=l100−l 200−2l=3l 5l=200 ∴l=40 cm

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In a meter bridge, null point is 20 cm, when the known resistance R is shunted by 10Ω resistance, null point is found to be shifted by 10 cm. Find the unknown resistance X.


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