If n is number of turns , B magnetic field strength , A area of coil and K torsional constant of suspension wire , then sensitivity is given by

The coil of a moving coil galvanometer is suspended in a magnetic field of 100 G. If the torsional constant of the suspension wire is 1.5 xx 10^(-8) Nm/rad, find the current sensitivity of galvanometer. The area of the coil is 0.05 m^(2) .

The coil of a moving coil galvanometer has 5 turns and each turn has an effective area of 2 xx 10^(-2) m^(2) . It is suspended in a magnetic field whose strength is 4 xx 10^(-2) Wb m^(-2) . If the torsional constant K of the suspension fibre is 4xx 10^(9) N m deg^(-1) . (a) Find its current sensitivity in degree per micro - ampere (b) Calculate the voltage sensitivity of the galvanometer for it to havefull scale deflection of 50 divisions for 25 mV. (c ) Compute the resistance of the galvanometer .

A rectangular coil of 100 turns each of area 10 cm^2 hangs freely in radial magnetic field. The coil deflects through an angle of 30^@ when current of 0.5 m A is paased through it . If torsional constant of suspension fibre is 2.5 xx10^-9 Nm/rad, then magnetic field will be ,

A rectangular coil of M.C.G. of 100 turns of effective area 12cm^2 hangs in a magnetic field of 1.5xx10^-2 T . If the torsional constant of the suspension fibre is 1.5xx10^-8 Nm per radian then current sensitivity of M.C.G. is

A rectangular coil of area vecA and number of turns n is placed in a uniform magnetic field vecB. If the coil carries a current I, then the torque acting on the coil is given by

The coil of moving coil galvanometer has an effective area 6xx10^-2m^2 . It is suspended in a magnetic field of 3xx10^-2Wbm^-2 . If the torsional constant of the suspension fibre is 5xx10^-9Nmdeg^-1 , finds its current sensitivity in degree per micro-ampere.

The expression for the torque acting on a coil having area of crosssection A , number of turns n , placed in a magnetic field of strength B , making an angle theta with the normal to the plane of the coil, when a current i is flowing in it, will be