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A lab voltmeter has scale as shown in fi...

A lab voltmeter has scale as shown in figure. A student uses this nearly ideal voltmeter to record potential difference between points A and B in the circuit shown. He could not see any deflection in the pointer and thinks that the voltmeter must be faulty. He replaces the voltmeter with another similar one. What reading will he record this time? Can you give some suggestion to record the potential difference across A and B ?

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The correct Answer is:
Zero. He shall use a milli voltmeter
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