+4 I have a sensitive galvanometer its coil consists of (100N) Turns, the cross-sectional area of each turn (5cm2 )and gives full scale deflection when an electric current (0.4mA) passes through it and the magnetic flux density acting on it (0.4T) if the plane of the coil makes an angle (60o) with the magnetic flux lines calculate:
The torque acting on the coil :
So i used the normal rule T=BIANsin(60o) ,
But when i used it [(0.4*(0.4*10^-3)*(5*10^-4)*100)*sin(60)=0.0000069282032303N.m] i find out It's not the right answer , when i looked in the right answer i find out that it should be like this
[(0.4*(0.4*10^-3)*(5*10^-4)*100)*0.5=0.000004N.m] , So my qustion is why should i replace the sin(60o) with the (0.5)???
