A moving coil galvanometer has following characteristics. Number of tuins of coil = 80, Area of coil = 50 m`m^(2)`: Resistance of coil = 20 `Omega`, Flux density of radial field 0.2 T , Torsional constant of suspension wire =` 5 xx 10_(-9)'N` m"/"rad. For this moving coil galvanometer, mark the correct statement(s)

Options

A. The angular deflection produced due to a potential difference of 0.01 mV is 0.08 div.
B. Current sensitivity of the device is 160 div"/"mA.
C. Voltage sensitivity of the device is 8 div"/"m V.
D. All of these

Answer

D

Explanation

Current sensitivity
`I_(S)=(theta)/(I)=(BAN)/(k)=(0.2xx50xx10^(-6)xx80)/(5xx10^(-9))"div""/"amp`
`=160xx10^(3)"div""/"mA=160"div""/"mV`
Voltage sensitivity, `V_(S)=(theta)/(V)=(BAN)/(kR)=(I_(S))/(R)=8"div""/"mV`
For V=0.01mV,`theta=8xx0.01=0.08"div"`