Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
or
How will you determine the direction of the magnetic field at the centre of a circular coil carrying current?
As shown in Fig, each section of wire produces its concentric set of lines of force. By applying right hand thumb rule, we find that all the sections produce magnetic field directed downward at all points inside the loop while at the outside points, the field is
directed upwards. Hence, the magnetic field acts normally into the plane of paper at the points inside the loop and normally out of the plane of paper at points outside the loop.
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