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Q.

Electric bulbs 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10   Ω. Maximum number of bulbs that can be connected so that they glow in fulI power is

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a

2

b

8

c

4

d

6

answer is C.

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Detailed Solution

When each bulb is glowing at fulI power,Current from each bulb =i'=50100  = 12 ASo main current, =i=n2  ampereAlso E=V+ir  ⇒  120=100+ n2  ×  10  ⇒  n=4
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Electric bulbs 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10   Ω. Maximum number of bulbs that can be connected so that they glow in fulI power is