4. A flux meter is a device that measures the magnetic field strength. The flux

Question

4. 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 m. 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.

Explanation / Answer

Using Faraday's law of Electromagnetic induction, induced emf is given as e = ( NBA - 0)/t

Or e × t = NBA,

Or IR × t = NBA

OR ( It) × R = NBA

OR. q × R = NBA

Hence B = (q × R)/( N × A)

B = 11.5 × 10-3 × 55.0 / 1700 × 5.1 × 10-4

0.073 × 10 = 0.73 T

Direction of Magnetic field is perpendicular to the plane of coil.

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