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  4. The value of alternating emf E in the given circuit will be

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Q. The value of alternating emf $E$ in the given circuit will bePhysics Question Image

KCETKCET 2008Alternating Current

Solution:

For series LCR circuit
$V=\sqrt{V_{R}^{2}+\left(V_{L}-V_{C}\right)^{2}}$
$=\sqrt{(80)^{2}+(40-100)^{2}}$
$=100 \,V$