The number of dry cells, each of e.m.f. `1.5` volt and internal resistance `0.5 omega` that must be joined in series with a resi

The number of dry cells, each of e.m.f. `1.5` volt and internal resistance `0.5 omega` that must be joined in series with a resistance of `20` ohm so as to send a current of `0.6` ampere through the circuit is -
A. 2
B. 8
C. 10
D. 12

The number of dry cells, each of e.m.f. `1.5` volt and internal resistance `0.5 omega` that must be joined in series with a resistance of `20` ohm so

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