Question

5. A cell sends a current through a resistance R for
time t. Now the same cell sends current through
another resistance r for the same time. If same
amount of heat is developed in both the
resistance, then the internal resistance of cell is
(R+r)
(R-r)
(1)
(2)
2.
2
.
(Rr)
(3)
(4) (Rr)
2​

Answer 1

When the current i is flowing through a conductor, the drift

velocity is v. If 2i current is flowed through the same

metal but having double the area of cross-section, then the

drift velocity will be 4 r