| ASSERTION: Heater wire must have high resistance and high melting point. |
| REASON: If resistance is high the electric conductivity will be less. |
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 :
Heater wire must have high resistance and high melting point, because in series current remains same, therefore according to joule's law \[H={{i}^{2}}Rt/4.2,\]heat produced is high if R is high. Melting point must be high, so that wire may not melt with increase in temperature.
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