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A 20 V 5 watt lamp is used in ac main 22...

A `20 V` 5 watt lamp is used in ac main `220 V` and frequency 50 c.p.s.
What pure resistance should be included in place of the above passive elements so that the lamp can run on its rated voltage?

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The correct Answer is:
`(a) 4.0 mu F (b) 2.53 H ( c) 720 Omega; (d) Using L or C will be more economical`
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