Moving Charges and Magnetism - Result Question 81
83. The resistance of an ammeter is $13 \Omega$ 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) $2 \Omega$
(b) $0.2 \Omega$
(c) $2 k \Omega$
(d) $20 \Omega$
[2007]
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Answer:
Correct Answer: 83. (a)
Solution:
- (a) We know
$ \begin{aligned} & \frac{I}{I_S}=1+\frac{G}{S} \\ & \frac{750}{100}=1+\frac{13}{S} \\ & S \Rightarrow 2 \Omega \end{aligned} $
