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Q.

Two wires made of same material have lengths in the ratio 1 : 2 and their volumes in the same ratio. The ratio of their resistances is

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a

4 : 1

b

2 : 1

c

1 : 2

d

1 : 4

answer is D.

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R∝I2 ∴V constant
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Two wires made of same material have lengths in the ratio 1 : 2 and their volumes in the same ratio. The ratio of their resistances is