Electric bulbs rated 50, W - 100, V glowing a | vedclass

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(C) For a bulb to glow at full power,the voltage across it must be its rated voltage,which is $V = 100\, V$.The current drawn by each bulb at full pow

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$4$

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(C) For a bulb to glow at full power,the voltage across it must be its rated voltage,which is $V = 100\, V$.The current drawn by each bulb at full power is $i' = \frac{P}{V} = \frac{50\, W}{100\, V} = 0.5\, A$.If $n$ such bulbs are connected in parallel,the total current drawn from the battery is $I = n 	imes i' = n 	imes 0.5 = \frac{n}{2}\, A$.The terminal voltage of the battery is given by $V = E - Ir$,where $E = 120\, V$ is the $EMF$ and $r = 10\,\Omega$ is the internal resistance.Substituting the values: $100 = 120 - (\frac{n}{2}) 	imes 10$.$100 = 120 - 5n$.$5n = 120 - 100 = 20$.$n = 4$.Thus,the maximum number of bulbs that can be connected is $4$.

Electric bulbs rated $50\, W$ - $100\, V$ glowing at full power are to be used in parallel with a battery of $120\, V$ and internal resistance $10\,\Omega$. The maximum number of bulbs that can be connected so that they glow at full power is:

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