11) When a d.c battery of e.m.f. E and internal resistance r delivers maximum power to an external resistance R, the ratio r/R is
a) 1:1
b) 2:1
c) 1:2
d) 1:1/2
12) A 200W and 100 W bulb both meat for operation at 220 V are connected in series. When connected to a 220 V supply, the power consumed by them is
a) 66 W
b) 33 W
c) 100 W
d) 300 W
13) In the above question, if the galvanometer is open circuited, the current in the various resistors will
a) not change
b) decrease
c) increase
d) cannot say
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