What is the shape of the magnetic field lines at the centre of a current carrying circular ring?
A
Circular
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B
Straight line
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C
Ellipse
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D
Magnetic field is zero at the centre
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Solution
The correct option is B Straight line The direction of the magnetic field of every small section of the circular loop can be found by using the right-hand thumb rule. At the centre the cumulative effect of all the field lines due to each small section is a straight line. The direction of the magnetic field at the centre of the circular coil is perpendicular to the plane of the coil i.e. along the axis of the coil.