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Q.

A fuse wire should have

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a

Low resistance and high melting point

b

Low resistance and low melting point.

c

High resistance and high melting point

d

High resistance and low melting point

answer is D.

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Detailed Solution

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Rate of heat generation is i2R. So for a given i more heat is generated if R is high. Also low melting point will let it to break when high current passes through it. 

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A fuse wire should have