A bulb with rating 100 V, 500 W is to be...

A bulb with rating 100 V, 500 W is to be connected in series with an unknown resistance and a battery of 200 volts. What must be the value of this unknown resistance such that the bulb still dissipates 500W.

25 OHM

50 OHM

20 OHM

10 OHM

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