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CBSE Class 12 Physics 2016 Delhi Set 1 Paper

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Question : 9
Total: 26
Two cells of emfs 1.5V and 2.0V having internal resistances 0.2Ω and 0.3Ω respectively are connected in parallel. Calculate the emf and internal resistance of the equivalent cell.
Solution:  
Calculation of emf
Calculation of internal resistance
‌ E. M. F ‌ ‌=‌
E12r2+E21
r1+r2

‌=‌
1.5×0.3+2×0.2
0.2+0.3
V
‌=‌
0.45+0.40
0.5
V=1.7V
r‌=‌
r1r2
r1+r2

‌=‌
0.2×0.3
0.2+0.3
Ω
‌=‌
0.06
0.5
Ω
‌=0.12Ω
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