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MHT CET 2026 Physics question

PhysicsMoving Charges and MagnetismMHT CET 2026

With a resistance 'X' connected in series with a galvanometer of resistance , it acts as a voltmeter of range 0 - 15 V. To double the range, a resistance of is to be connected in series with 'X' The value of 'X' in is

Answer: (C)

Solution

Let be the full-scale current of the galvanometer. First case: . Second case (range 30 V): . Subtracting the first from the second: , so A. Then , so , option (C).

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Question ID VK-100088