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Principle of Superposition

A carrier wav...

Question

A carrier wave of peak voltage $12 V$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75$ % is

A

6 V

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B

9 V

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C

4 V

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D

15 V

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Solution

The correct option is B $9 V$
The modulation index is given as $m = \frac{V_{m}}{V_{c}}$
$\Rightarrow 0.75 = \frac{V_{m}}{12}$
$\Rightarrow V_{m} = 9 V$

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Principle of Superposition

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