| Assertion (A): The same amount of current flows through the filament and line wire. But more heat is produced in filament. |
| Reason (R): Filament is made of material having high resistance and high melting point. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: Heat produced = \[\operatorname{H}={{i}^{2}}\operatorname{Rt}\] |
| H\[\propto \]R Since resistance of filament >> Resistance of wire so more heat is produced in filament. |
| Therefore, Assertion is true. Filament is made of material having high resistance like tungsten so that heat produced is more. |
| Melting point of the material also should be high so that it can sustain more heat. Hence reason is also true. Reason properly explains the assertion. |
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