| ASSERTION: Fuse wire must have high resistance and low melting point. |
| REASON: Fuse is used for small current flow only. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
Fuse wire must have high resistance because in series current remains same, therefore according to joule's law\[H=\frac{{{i}^{2}}Rt}{4.2}\], heat produced is high if R is high. The melting point must be low so that wire may melt with increase in temperature. As a current larger than the specified value flows through the circuit the temperature of the fuse wire increases. This melts the fuse wire and breaks the circuit.
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