Question

A flux meter is a device that measures the magnetic field strength. The flux meter has a conduction coil of 1700 turns with the area of the coil as 5.10 X 10-4 m2 . The coils are connected to a galvanometer and has a total resistance of 55.0 ohms. The coil is moved from a region where the magnetic field is zero into a region where it is nonzero, the normal coil to the coil being kept parallel to the magnetic field. The amount of charge that is induced to flow around the circuit is measured to be 11.5 mC. What is the value reading on the meter and which direction is the magnetic field.

Answer 1

Current through galvanometer (average) = charge/time Therefore emf (average) = i_avg R = charge times Resistance/time eq 1) Also, emf = change in flux/time = field times Area times no. of turns/times eq ii) from 1) & 2) field = charge times Resistance/Area times No. of turns Field = 11.5 times 10^- 3 times 55/(5.1 times 10^- 4) times 1700 = 0.7295 Tesla Ans Hit like if you understood.