(a) Of what substance is the fuse wire made? Why?
(b) Explain why, a copper wire cannot be used as a fuse wire.

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Solution

(a) A fuse wire is made of tin-plated copper because it has a low melting point. If the current exceeds a safe value, the wire melts and breaks the circuit.
(b) A pure copper wire cannot be used as a fuse wire because it has a high melting point. Due to this, it will not melt easily in case of a short circuit.

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