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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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