Q.

In India electricity is supplied for domestic use at 220 V. 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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a

R

b

2R

c

R4

d

R2

answer is C.

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Detailed Solution

Since, power rating of bulb in both the countries India and USA should be the same, so∴    V12R1 =V22R2⇒   220  × 220 R1  =   110  × 110 R2⇒  R2R1=  110220 ×  110220⇒   R2  =  R4     ∵   R1=R
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