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Q.

Different combination of 3 resistors of equal resistance R are shown in the figures. The increasing order for power dissipation is:
 

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a

PC<PD<PA<PB

b

PB<PC<PD<PA

c

PA<PB<PC<PD

d

PC<PB<PA<PD

answer is A.

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Detailed Solution

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R1=3R2=1.5R 

R2=2R.R2R+R=2R3=0.6R

R3=R3=0.3R

R4=3R

As current is same P∝R

PC<PB<PA<PD

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Different combination of 3 resistors of equal resistance R are shown in the figures. The increasing order for power dissipation is: