BITSAT 2019 Slot 2 Solved Paper

Given, for an ammeter, Ig=1A,Rg=15Ω
Total current, I=4A
If Rs be the shunt resistance, then
according to the question circuit diagram is given,
(Rs∥Rg., hence have equal potential difference) where, IgRg=(I−Ig)Rs
Rs=

Ig

I−Ig

×Rg =

1

4−1

×1.5=0.5Ω