In a moving coil galvanometer the deflection `(phi)` on the scale by a pointer attached to the spring is
In a moving coil galvanometer the deflection `(phi)` on the scale by a pointer attached to the spring is
A. `((NA)/(kB))I`
B. `((N)/(kAB))I`
C. `((NAB)/(k))I`
D. `((NAB)/(kI))`
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Correct Answer - C
Since magnetic torque on the coil, `tau=NIAB`
This torque is balanced by counter torque
`therefore" "kphi=NIAB or phi=((NAB)/(k))I`
where k is torsional constant. It is a scalar quantity having dimension of torque or enegy i.e. `[ML^(2)T^(-2)]`
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