Question

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 $\Omega$

Answer 1

Answer: (A)

2 $\Omega$

Answer 2

$13 \times 100=650 \times R$ $\Rightarrow R =2\, \Omega$