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Question
If the reading of the voltmeter V1 is 40 V, then the reading of voltmeter V2 is ______.
Options
30 V
58 V
29 V
15 V
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Solution
If the reading of the voltmeter V1 is 40 V, then the reading of voltmeter V2 is 30 V.
Explanation:
We know that
Vrms = `"V"_0/sqrt(2)`
= `(50sqrt(2))/sqrt(2)`
Vrms = 50
V2 = `sqrt("V"_("rms")^2 - "V"_1^2)`
= `sqrt((50)^2 - (40)^2)`
V2 = 30
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