| ASSERTION: Though the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher than that in line wires. |
| REASON: The filament of bulbs is made of a material of high resistance and high melting point. |
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: B
Solution :
As filament of bulb and the 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 wires hence heat produced in the filament is much higher than that in line wires.
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