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A current of 500muA deflects the coil of...

A current of `500muA` deflects the coil of a moving coil galvanometer through `60^@`. What should be the current to cause the rotation through `pi//5` radian? What is the sensitivity of galvanometer?

Text Solution

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Here, `I_1=500muA=500xx10^-6A`,
`theta_1=60^@`, `I_2=?`. `theta_2=pi/5rad.=180^@/5=36^@`
`I_1=(k)/(nBA)theta_1` and `I_2=(k)/(nBA)theta_2`
`:. I_2/I_1=theta_2/theta_1` or
`I_2=theta_2/theta_1I_1=36/60xx500xx10^-6=300xx10^-6A`
Current sensitivity `=theta_2/I_2=(36^@)/(300xx10^-6)`
`=0*12xx10^-6degree//A=0*12 degree//muA`
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