Q.

Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be

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a

2 : 1

b

4 : 9

c

9 : 4

d

1 : 2

answer is B.

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Detailed Solution

Power consumed, P=i2R          Peq1=(i/3)2×3R+(i/3)2×3R=23i2R         ......(i) (ii)     Peq2=(i/2)2×R+(i/2)2R+i2R                       =32i2R                    .........(ii) Divide equation (i) by (ii),   we get Peq1Peq2=23i2R32i2R=49
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