Solve and explain:
1. A cell supplies a current of 0.6 A through a 2ohm coil and a current of 0.3 A through a 8 ohm coil. Calculate the emf of the internal resistance of the cell.
Dear Student,
Let, ‘r’ be the internal resistance of the cell and V be its EMF.
V = (2 + r)0.6 …………….(1)
V = (8 + r)0.3 …………….(2)
Solving (1) and (2) we get,
V = 3.6 V (emf of the cell)
r = 4 Ω (internal resistance)
Regards