Question

A piece of wire P and three identical cells are connected in series. An amount of heat is generated in
a certain time interval in the wire due to passage of current. Now the circuit is modified by
replacing P with another wire Q and N identical cells, all connected in series. Q is four times longer
in length than P. The wire P and Q are of same material and have the same diameter. If the heat
generated in second situation is also same as before in the same time interval, then find N.
(a) 4
(c) 16
(d) 36
(b) 6​

Answer 1

Answer:

(a) 4 is the right answer.Hope this helps you