Current Electricity - Result Question 82
87. A $5^{\circ} C$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately
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======= ####87. A $5^{\circ} C$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $10^{\circ} C$
(b) $16^{\circ} C$
(c) $20^{\circ} C$
(d) $12^{\circ} C$
[1998]
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Answer:
Correct Answer: 87. (c)
Solution:
- (c) Since $H \propto I^{2}$, doubling the current will produce 4 times heat. Hence, the rise in temperature will also be 4 times i.e., rise in temperature $=4 \times 5=20^{\circ} C$.
