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When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This means 

(a) input voltage cannot be AC voltage, but a DC voltage. 

(b) maximum input voltage is 220V. 

(c) the meter reads not v but 2> and is calibrated to read √< v2 > . 

(d) the pointer of the meter is stuck by some mechanical defect.

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(c) the meter reads not v but 2> and is calibrated to read √< v2 > . 

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