An AM wave varies from \( 10 \mathrm{~V} \) to \( 4 \mathrm{~V} \). Its percentage modulation is...

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An AM wave varies from \( 10 \mathrm{~V} \) to \( 4 \mathrm{~V} \). Its percentage modulation is
(a) \( 36 \% \)
(b) \( 42.8 \% \)
(c) \( 54 \% \)
(d) \( 68 \% \)
\( { }_{\mathrm{P}}^{\mathrm{W}} \)
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