Physics

Problem

A closely wound circular coil of 20 turns has a radius of

5.0\,\text{cm}

and carries a current of

3.0\,\text{A}

. a. (i) Calculate the magnitude of the magnetic field at the centre of the coil. b. (ii) Determine the magnetic field magnitude at a point on the axis at a distance of

8.0\,\text{cm}

from the centre on the side where the current appears counter-clockwise. c. (iii) What percentage of the magnetic field at the centre does the field obtained in part (ii) represent? Round your answer to two significant figures.

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