Physicshard · Past Paper
A galvanometer with a resistance of 100 Ohms gives full scale deflection for a current of 1mA. How much series resistance is needed to convert it into a voltmeter of range 0-10V?
A9900 Ohms
B10000 Ohms
C9000 Ohms
D10100 Ohms
✓ Correct Answer: A — 9900 Ohms
V = Ig(Rg + R). 10 = 0.001(100 + R) => 10000 = 100 + R => R = 9900 Ohms.
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