STANDARDPhysics-Current Electricity
STANDARD Physics Galvanometer MCQ Question
Type: MCQ-numerical-Medium-Class 12
A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. To convert the meter into a voltmeter of range 0 to 18 V, the required resistance is
A
5885 Ω in series
B
4485 Ω in series
C
5885 Ω in parallel
D
4485 Ω in parallel
Correct Answer
Option B
Detailed Explanation
The galvanometer can be transformed into a voltmeter by applying a high resistance in series. If the series resistance is R, then total resistance in circuit = (15 + R) Ω. Now, 15 + R = V/I = 18/(4×10⁻³) = 4500 Ω. Therefore, R = 4500 - 15 = 4485 Ω.
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