A) 30 V
B) 60 V
C) 50 V
D) 40 V
Correct Answer: B
Solution :
(b) 60 V For first case, \[\frac{\varepsilon }{R+r}=\frac{10}{R}\] .(1) For second case, \[\frac{\varepsilon }{5R+r}=\frac{30}{5R}\] (2) Dividing eq. (1) by eq. (2), we get \[r=5R\] From eq. (1), \[\frac{\varepsilon }{R+5R}=\frac{10}{R}\] \[\varepsilon =60\,V\]
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