Question

a current supplies current i1 through a coil of resistance r1 and a current i2 through another coil of resistance r2 when connected separately. find the expression for the internal resistance and emf of the cell in terms of current and external resistance

Answer 1

Answer:

I2R2-I1R1/I1-I2

Explanation:

Let E be the emf of the cell then

r = internal resistance

Answer 2

Answer:

I1R1R2(I1-I2)/(I2R2-I1I1)