Question

The magnetic field line passing through the centre of a circular current carrying conductor is a

• A. True
• B. False
• C. Straight line
• D. Parabolic

Answer 1

The correct option is C

Straight line

In a circular coil, the field lines near the coil are circular because the field near the edges is affected by only one small part of the conductor which is close to the point but as we move towards the centre, the field is affected by all parts of the conductor equally and the sum of the effects is such that the field becomes a nearly straight line.