As per the given question,
the potential difference with the full scale deflection=70mV
The current reading with the full scale deflection=20mA
Resistance of the shunt=?
Range of the current =0-50A
So, G=iV=2070=3.5Ω
We know that, S=I−IGIG×G
S=50−20×10−33.5×20×10−3=50−0.020.07
S=49.080.07=0.00142Ω
Or, S=1.42×10−3Ω
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