In AM, the centpercent modulation is achieved when

Carrier amplitude = signal amplitude

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{C a r r i e r a m p l i t u d e}^{- 1}

= signal amplitude

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Carrier frequency = signal frequency

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{C a r r i e r f r e q u e n c y}^{- 1}

= signal frequency

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Solution

The correct option is A Carrier amplitude = signal amplitude
When signal amplitude is qual to the carrier amplitude, the amplitude of carrier ware varies between 2A and zero.

$m_{a} = \frac{A m p l i t u d e c h a r g e o f c a r r i e r}{A m p l i t u d e o f n o r m a l c a r r i e r} = \frac{2 A - A}{A} \times 100$ = 100%

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