In India electricity is supplied for domestic use at 220V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be :

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2 R

answer is B.

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Detailed Solution

RAB=ρl2π2r2=ρl8πr2, RBC=ρl2πr2=ρl2πr2⇒RBC=4 RABBoth are connected in series so VBC=4 VABAlso, PBCPAB=I2RBCI2RAB=4

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