A galvanometer needs `30mV` for a full scale deflection of 30 divisions. Determine its voltage sensitivity. What must be its resistance if its current sensitivity is `2"div"//muA`?

Answer

`10^3 div//V`; `2000Omega`

Explanation

Voltage needed, `V=30mV=30xx10^-3V`
Deflection of division, `n=30`
`:.` Voltage sensitivity, `V_s=n/V=(30)/(30xx10^-3)`
`=10^3 d iv//V`
Resistance of galvanometer is
`R_G=(I_s)/(V_s)=(2 d iv//muA)/(10^3 d iv//V)=(2xx10^6 d iv//A)/(10^3d iv//V)`
`=2000Omega`