Question

The material used for electric fuse is an alloy of tin and lead. This alloy should have:

A High specific resistance and low melting point. Correct Answer Incorrect Answer
B Low specific resistance and high melting point. Correct Answer Incorrect Answer
C Low specific resistance and low melting point. Correct Answer Incorrect Answer
D High specific resistance and high melting point. Correct Answer Incorrect Answer

Solution

The material used for electric fuse is an alloy of n and lead. • This alloy has high specific resistance and also low melting point so that it melts as soon as large current flows through the wire. Hence option A is correct. • The specific resistance is constant for a wire irrespective of the length or cross-sectional area of the wire.

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