2 A current of 12 Ampere runs through the Parallel Wire Appa

2. A current of 12 Ampere runs through the Parallel Wire Apparatus. What is the anticipated mass (in milligrams) for balancing the frame-balance? Pick the necessary data from task [2] of the Analysis, the book value of k, and d=0.5 cm

Solution

Force between parallel wires = Force due to weight

u_oI²L/2pid =mg

Since K=u_o/2pi =2*10^-7

=>m=KI²L/dg =(2*10^-7)*12²*0.265/(0.5*10^-2)*9.81

m=1.556*10^-4 kg =0.1556 mg