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Question

The amplitude of carrier wave is $12 V$ . For modulation index of $50$ %, the amplitude of modulating signal is ______ V

A

3

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B

6

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C

12

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D

9

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Solution

The correct option is C $6$
Given:
The amplitude of the carrier wave is $12 V$ .
The modulation index of the signal is $50 %$ .

Modulation index of the signal is given by:
$μ = \frac{A_{m}}{A_{c}}$
$A_{m} = μ A_{c} = (\frac{50}{100}) \times 12$
$A_{m} = 6 v o l t$

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