AIPMT PRELIMS2007Physics-Current Electricity
AIPMT PRELIMS 2007 Physics Ammeter and Shunt MCQ Question
Type: MCQ-numerical-Medium-Class 12
The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is
A
2 Ω
B
0.2 Ω
C
2 kΩ
D
20 Ω
Correct Answer
Option B
Detailed Explanation
Using the formula for shunt resistance Rₛ = (Rₐ × Iₘ)/(I - Iₘ), where Rₐ = 13 Ω, Iₘ = 100 Å, and I = 750 Å, solving gives Rₛ = 0.2 Ω.
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