Question

A galvanometer having a coil resistance of `100 omega` gives a full scale deflection , when a current of `1 mA` is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of `10A` , is :
A. `0*01Omega`
B. `2Omega`
C. `0*1Omega`
D. `3Omega`

Answer 1

Here, `G=100Omega`, `I_g=1MA=10^-3A`, `I=10A` Shunt resistance,
`S=(I_gG)/(I-I_g)=(10^-3xx100)/(10-10^-3)=(10^-1)/(10)=0*01Omega`