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Q.

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

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answer is 4.

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Detailed Solution

When each bulb is glowing at full power,Current from each bulb i=PV=50100=12ASo main current i=n2A Also E=V+ir⇒120=100+n2×10⇒n=4
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