Power dissipated in an LCR series circuit connected to an a.c. source of emf is :

1. A. 2R ,/ , R 2+ (L - 1 C ) 2
2. B. 2R ,/ , [R 2+ (L - 1 C ) 2 ]
3. C. 2 [R 2+ (L - 1 C ) 2 ] ,/ ,R
4. D. 2 [R 2+ (L - 1 C ) 2 ] ,/ ,R

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