NEET Class neet Answered
Calculate emf of the cell
Asked by Prashant DIGHE | 20 Jul, 2019, 12:54: PM
Expert Answer
Let E be emf of cell and r be its internal resistance .
current i1 drawn by resistance R1 is given by, i1 = E/( R1 + r ) ................ (1)
current i2 drawn by resistance R2 is given by, i2 = E/( R2 + r ) ................ (2)
we get internal resistance r from eqn.(1) as, r = (E/i1) - R1 .............(3)
By substituting r from eqn.(3), eqn.(2) is rewritten as, i2 = E / [ R2 + (E/i1) - R1 ] ............ (4)
we get the emf E from eqn.(4) as, E = [ i1 i2 / ( i2 - i1 ) ] ( R1 - R2 )
Answered by Thiyagarajan K | 20 Jul, 2019, 05:47: PM
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