Question

Assertion: Fuse wire must have high resistance and low melting point.
Reason: Fuse is used for small current flow only.

A.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B.) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C.) Assertion is correct but Reason is incorrect
D.) Assertion is incorrect but Reason is correct

Answer 1

Hint: The main objective of using fuse wire in any electric circuit is to provide protection against short circuit or overload current.

Complete step-by-step answer:
Now we have been given the Assertion that-
Fuse wire must have high resistance and low melting point.

And the reason for it is given-
Fuse is used for small current flow only.

So, to know whether the Assertion and Reason is right or wrong, we will first discuss the fuse.

The fuse is the protecting device, and the main objective of using the fuse wire in electric circuits is to provide protection against short circuit or overload current.

This means it protects the circuit from huge amounts of current flow as it causes the damage to the circuit.

Since, the fuse protects the circuit from very high current damage, so the fuse wire should be selected in such a way that it burns and breaks the circuit when a large amount of current flows. For this purpose, the material used as fuse wire should have high resistance and low melting point.

Since, the fuse wire has high resistance, the wire heats up quickly, when huge current flows. The temperature around the fuse wire rapidly rises, when it reaches the melting point of the material it burns and protects the circuits.

So, we can say that the Assertion is right but the Reason is not correct as the fuse wire can be used for high current flow also.

Hence, the correct option is C.

Note: While solving such types of questions, first know about what fuse is and then know about the properties of fuse wire. As mentioned in the solution, the fuse is used as a protecting device in any electric circuit. It prevents the circuit from any high current or overcurrent damage. So, the fuse wire must have high resistance and low melting point. So, as mentioned in the solution the Assertion is correct but the reason is incorrect.