What is immaterial for an electric fuse wire

Specific resistance of the wire

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radius of the wire

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length of the wire

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current flowing through the wire

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Solution

The correct option is D length of the wire
We know that length is immaterial for fuse wire because melting of a fuse wire is independent of length of fuse wire.

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Specific resistance of aluminum is $2.75 \times 10^{8} Ω - m$ .

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