In which of the following the strength of the magnetic field at the centre of a circular coil of wire depends on

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Radius of coil

Number of turns of the coil

Current flowing in the coil

All of these

answer is D.

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Detailed Solution

The strength of the magnetic field at the centre of a circular coil of wire depends on the radius of the coil, the number of turns of the coil, and the current flowing in the coil.
The strength of the magnetic field at the centre of a current-carrying circular coil depends on
●       the radius of the coil - It is inversely proportional to the radius of the coil. The more the radius, the less the strength of the magnetic field.
●       the number of turns in the coil - It is directly proportional to the number of turns in the coil. The more turns in the coil more will be the strength of the magnetic field.
●       strength of the current flowing in the coil - It is directly proportional to the current strength flowing in the coil. The more the strength of the current flowing, the more the strength of the magnetic field.

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