Permissible current through a fuse wire of diameter 1 mm is 1A. What should be the radius of a fuse wire, made of same material, whose permissible current is 8A ?

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4 mm

8 mm

3 mm

6 mm

answer is A.

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Detailed Solution

i2∝r3⇒r1r=i1i2/3⇒d11=812/3⇒d=4 mm.

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