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Q.

Bulb B1 has rating P1 watt, V volt and bulb B2 has rating P2 watt, V volt. If P1 > P2, then

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a

In combination-I, brightness of B1 is less than the brightness of B2.

b

In combination -II brightness of B1 is more than the brightness of B2.

c

In combination-I brightness of B1 is same as the brightness of B2.

d

In combination-II, brightness of B1 is less than the brightness of B2.

answer is D.

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Detailed Solution

Resistances of B1 and B2 are given by R1 = V2/P1 and R2 = V2/P2 respectively.In combination-I, P11=Vo2R1     and      P21=  V02R2. since R1 < R2, we  can conclude P11>P21 .In combination-II, P11=i2R1     and       P21=i2R2 . since R1 < R2, we  can conclude P11
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