a search coil for measuring b (also called a flip coil) is a small coil with N t

Question

a search coil for measuring b (also called a flip coil) is a small coil with N turns, each of the cross-sectional area A. it is connected to a so-called ballistic galvanometer, which is a device to measure the total charge Q that passes through it in a short time. The flip coil is placed in the magnetic field to be measured with its face perpendicular to the field. It is then quickly rotated by 180 degrees. Show that the total charge Q that flows in the induced current during this short "flip time" is proportional to the magnetic field strength B; in a particular, show that B can be calculated from B=QR/2NA

Explanation / Answer

We knoe that the induced emf = - NB / t

                                 hence the magnetic field B=  Q R /2NA    

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