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MHT CET Physics question

PhysicsCurrent ElectricityMHT CET

A cell has an emf of 3 volt and internal resistance 2 . It is connected to an ammeter having resistance 2 and to an external resistance of 100 . When a voltmeter is connected across the 100 resistance, the ammeter reading is 40 mA. The resistance of the voltmeter is

Answer: (D)

Solution

Total resistance = , so the parallel combination of 100 and is ; gives $

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Question ID VK-045272