AIPMT PRELIMS 2010 Physics Galvanometer MCQ Question
A galvanometer has a resistance of 100 Ω and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be
1000 Ω
900 Ω
1800 Ω
500 Ω
Correct Answer
Detailed Explanation
To convert a galvanometer into a voltmeter, a series resistance is added. The resistance R is calculated using the formula R = V/I - G, where V is the voltage range, I is the current, and G is the galvanometer resistance.
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