Question

A given length of a wire are doubled on itself and this process is repeated once again. By what factor does the resistance of the wire change​

Answer 1

As length of the wire is reduced to L/2, area increases by 2 times. Again the process is repeated, hence L will become L/4As length of the wire reduced by L/4, area increases by 4 times. The new resistance of the wire will be effective resistance of the resistors in parallel.

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