SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

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

1 Answer
5876 Votes
3537

Answer Key : (c) -

(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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Two cells having emf 4V, 2V and internal resistances 1  1  are connected as shown in figure below. Current through 6  resistance is

a)

b)

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1A

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