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In a metre bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is

Asked in CBSE AIPMT 1999 · Metre bridge

Answer: (4) 0.25 Ω

Step-by-step solution

Unknown X in the left gap, 1 Ω in the right gap, balance 20 cm from the left.

X/1=(20)/(100-20)=(20)/(80).

X=0.25 Ω.

Why the other options are wrong

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