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An electric bulb rated for 500 W at 100 ...

An electric bulb rated for `500 W` at `100 V` is used in a circuit having a `200 V` supply. The reistance `R` that must be put in series with bulb, so that the bulb delivers `500 `W is ……….`Omega`.

A

`10Omega`

B

`20 Omega`

C

`50 Omega`

D

`100 Omega`

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The correct Answer is:
B
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