MHT CET 2025 Physics question
With a resistance 'X' connected in series with a galvanometer of resistance 100 , it acts as a voltmeter of range 0 - 15 V. To double the range, a resistance of 1500 is to be connected in series with 'X'. The value of 'X' in ohm is
Answer: (C)
Solution
A galvanometer converted into a voltmeter has range , where is the full-scale current. For 15 V: . To double the range to 30 V, an extra 1500 Ω is added in series: . Dividing the second by the first:
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