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Question: When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diam...

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become

A

Two times

B

Four times

C

Eight times

D

Sixteen times

Answer

Sixteen times

Explanation

Solution

In stretching of wire R∝1r4R \propto \frac { 1 } { r ^ { 4 } }