A) both length and radius of the wire are halved
B) both length and radius of the wire are doubled
C) only radius is doubled
D) only length is doubled
Correct Answer: B
Solution :
From Joules law, the heat (H) produced \[(H)=\frac{{{V}^{2}}}{R}\] ?. (i) Also, \[R=\frac{\rho l}{A}=\frac{\rho l}{\pi {{r}^{2}}}\] ... (ii) On doubling I and r both, R can be reduced to half.
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