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An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to

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An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to 

(1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity
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An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to 0.9 times dc sensitivity

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