Find the value of current from battery in the circuit ............... $A$
A$1$
B$2$
C$3$
D$4$
Medium
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D$4$
d
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The number of dry cells, each of $e.m.f.$ $1.5\,volt$ and internal resistance $0.5\, ohm$ that must be joined in series with a resistance of $20\, ohm$ so as to send a current of $0.6\,A$ through the circuit is
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