Question

# The specific resistance of a wire is ρ, its volume is 3m3 and its resistance is 3ohms, then its length will be

A
B
C
D

Solution

## The correct option is A Volumn = Al=3 ⇒ A=3l Now R=ρlA⇒ 3=ρ× l3/l=ρl23⇒ l2=9ρ=3√ρ

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