Question

Assertion :Through the same current flows through the linewires and the filament of the bulb but heatproduced in the filament is much higher then thatin line wires. Reason: The filament of bulbs is made of a material of high
resistance and high melting point.

• 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. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

As filament of bulb and line wire are in series, hence current through both is same. Now, because $H=\frac{i^{2}Rt}{4.2}$ and resistance of the filament of the bulb is much higher than that of line wires, hence heat produced in the filament is much higher than that inline wires. Hence Both Assertion and Reason are correct and Reason is the correct explanation for Assertion