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When a voltage measuring device is conne...

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

A

input voltage cannot be ac voltage, but a dc voltage

B

maximum input voltage is 220 V

C

the meter reads not v but `lt v^2 gt` and is calibrated to read `sqrt(ltv^2gt)`

D

the pointer of the meter is stuck by some mechanical defect

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