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In an `FM` system a `7 kHz` signal modulates `108 MHz` carrier so that frequency deviation is `50 kHz`. The frequency modulation index is

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In an `FM` system a `7 kHz` signal modulates `108 MHz` carrier so that frequency deviation is `50 kHz`. The frequency modulation index is
A. 7.143
B. 8
C. 0.71
D. 350
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