A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to current, the temperature of the wire is raised by \[\Delta \]T 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 2 L. The temperature of the wire is raised by the same amount \[\Delta \]T in the same time t. the value of N is [IIT-JEE (Screening) 2001]

A wire of length L and 3 identical cells of negligible internal resist

1.	A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to current, the temperature of the wire is raised by \[\Delta \]T 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 2 L. The temperature of the wire is raised by the same amount \[\Delta \]T in the same time t. the value of N is [IIT-JEE (Screening) 2001]
A.	4
B.	6
C.	8
D.	9
Answer» C. 8