Current Electricity and Electrical InstrumentHard
Question
Two cells of unequal emfs e1 and e2, and internal resistances r1 and r2 are joined as shown. VA and VB are the potentials at A and B respectively.
Options
A.One cell will continuously supply energy to the other
B.One cell will continuously supply energy to the other
C.The potential difference across both the cells will be equal
D.VA - VB = 
Solution
(A, B, C, D) VA − VB = Eeq = 
= 
If e1 > e2 source e1 act as a source and e2 act as a load.
and V1 = e1 − ir1
V2 = e2 + ir2
V1 = V2 as i =
for e1 > e2
= If e1 > e2 source e1 act as a source and e2 act as a load.
and V1 = e1 − ir1
V2 = e2 + ir2
V1 = V2 as i =
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