A wire of length L and 3 identical cells, of negligible internal resistance, are connected in series. Due to the current, the temperature of the wire is raised by 
T in a time t. A number of TV similar cells are now connected in series with a wire of the same material and area of cross-section but of length 2L. The temperature of the wire is raised by the same amount 
T in the same time. Find the value of N.
Text Solution
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(6)
In the first case
When the length of the wire is doubled, resistance and mass both are doubled. Therefore, in the second case,
Dividing Eq.(ii) by (i) we get
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