A wire of length L and three identical cells of negligible internal resistance are connected in series. Due to the current, the temperature of the wire is raised by Δ T in time t. N identical cells are now connected in series with a wire of length 2L of same material and cross-section. The temperature is raised by same amount Δ T in same time t. The value of N is -
Text Solution
Verified by ExpertsThe correct answer is:
A
where 
is density.
Solving Eqs. (i) and (ii), we get 
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