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RMS Value

The frequency...

Question

The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120V. Then the r.m.s. value of voltage is

A

101.3V

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B

84.8V

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C

70.7V

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D

56.5V

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Solution

The correct option is B 84.8V
$V_{r m s} = \frac{V_{0}}{\sqrt{2}} = \frac{120}{1.414} = 84.8 V$

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