A wire of length L and 4 identical cells of negligible internal resistance are connected in series. Due to the current, the temperature of the wire is raised by ΔT in a time t. A number N of similar cells is now connected in series with a wire of the same material and cross section but of length 4L. The temperature of the wire is raised by the same amount ΔT in the same time t. The value of N is
-
UP 0 DOWN 0 0 0
