An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index

0.2

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0.67

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1.5

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Solution

The correct option is B 5
The formula for modulation index is given by
$m_{f} = \frac{δ}{v_{m}} = \frac{F r e q u e n c y v a r i a t i o n}{M o d u l a t i n g f r e q u e n c y} = \frac{10 \times 10^{3}}{2 \times 10^{3}} = 5$

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