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A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection for 30 mA current. It is to work as a voltmeter of 30 volt range, the resistance required to be added will be
Option: 1
Option: 2
Option: 3
Option: 4
Answers (1)
Voltage range required is 30 V
Let resisitance added is R then (100+R) . 30 mA = 30 V
= 100 + R = 1000
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