A galvanometer coil has a resistance of 10 Ω and the meter shows full scale deflection for a current of 2 mA . What resistance needs to be connected to convert the meter into a voltmeter of range 0 to 18 V ?

Question

A galvanometer coil has a resistance of 10 Ω and the meter shows full scale deflection for a current of 2 mA . What resistance needs to be connected to convert the meter into a voltmeter of range 0 to 18 V ?, 8880 Ω, 8990 Ω, 9000 Ω, 9010 Ω

MARKS App · Accepted Answer

To make the galvanometer as a voltmeter, we have to connect a series shunt resistance. V = i R G + R s ⇒ 18 = 2 × 10 - 3 × 10 + R s ⇒ 18 × 1000 2 = 10 + R s ⇒ 9000 = 10 + R s ⇒ R s = 9000 - 10 = 8990 Ω

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