A storage battery has $e.m.f.$ $15\, volts$ and internal resistance $0.05\, ohm$. Its terminal voltage when it is delivering $10\, ampere$ is ............... $volts$
A$30$
B$1.00$
C$14.5$
D$15.5$
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C$14.5$
c (c) $V = E - IR = 15 - 10 \times 0.05 = 14.5\,V$
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