Asked by  | 10th May, 2011, 06:10: AM

Expert Answer:

We know that Resistance is equal to
By question it is given that L is increased by 20%, then final length will be
From the above equation we know that Resistance is directly proportional to L, therefore equivalent resistance will be
Therefore (b) is the required answer.

Answered by  | 10th May, 2011, 06:57: PM

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