Discussion :: Measurements and Instrumentation
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In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be
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Answer : Option B
Explanation :
C = 0.41 L/R2
or C = (0.41 x 0.3)/(2000)2 = 0.0311 x 10-6 F.
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