Electro- magnetism questions | form six Physics

State two conditions to be fulfilled for a galvanometer to be used as a ballistic galvanometer.

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Consider a small flat coil which has N turns of area A and whose plane is perpendicular to a magnetic field of flux density B. If the search coil is connected to the ballistic galvanometer and the total resistance of the circuit is R, use the laws of electromagnetic induction to show that the charge delivered to the galvanometer does not depend on how long it takes to remove the search coil from the field.

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A circular coil of 300 turns has a radius of 10 cm and carries a current of 7.5A. Calculate the magnetic field at:

1. The centre of the coil
2. A point which is at a distance of 5cm from the centre of the coil.

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Mention the three magnetic materials and briefly explain each one.

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Give the differences between three magnetic materials in terms of their magnetic susceptibility.

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