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A Galvanometer is an instrument that can be used to construct an ammeter for measuring current. It can be used to convert to a voltmeter. It can also be used as a multimeter. In all cases resistance must be connected to galvanometer either in series or in parallel to effect the change. To turn into an ammeter a low resistance in parallel of suitable value and to convert to a voltmeter a resistance is connected in series. You are given a galvanometer for which a current of 10 mA is required for full deflection. The internal resistance of the galvanometer is 100 ohm.Then answer the following questions.To double the full scale voltage reading of any galvanometer turned into a voltmeter, you must1 Doubles the resistance R extra connected2 Half the resistance R3 Increases the resistance to 4R4 More than 2R |
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Answer» Correct option (4) More than 2R Explanation: V = (G + R) Ig To increase the range of voltmeter, resistance R must be increases. V ∝ R If we want to double the range, more than 2R, added |
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