Consider a rectangular slab of length  and area of cross section  A current  is passed through it. If the length is doubled, the potential drop across the end faces a) Becomes half of the initial value b) Becomes one-fourth of the initial value c) Becomes double the initial value d) Remains same

Question ID - 150218 :- Consider a rectangular slab of length  and area of cross section  A current  is passed through it. If the length is doubled, the potential drop across the end faces a) Becomes half of the initial value b) Becomes one-fourth of the initial value c) Becomes double the initial value d) Remains same

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(c)

Resistance of the slab  where

The potential across  is

The length of the slab is doubled. Therefore the resistance is  Assuming that the same current is passed, the potential across the new resistance is

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