Verified Solution • 2025–26 Session moderate

QPages 275-276: Q5: HC Verma: Concepts of Physics - Volume 2 Permanent Magnets Pages 275-276: Q5 Solution: Sketch the magnetic field lines for a current-carrying circular …

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.

Step-by-Step Verified Solution

**Answer:** The field lines near the centre of a current loop are straight and parallel to the axis. The field lines near the centre of an equivalent dipole are also parallel but may differ in the far field. **Step-by-Step Explanation:** For a circular current loop, the magnetic field at the centre is uniform and directed along the axis. For an equivalent magnetic dipole, the field near the centre is also axial but the field lines spread out differently at larger distances. The difference is in the detailed shape of the field lines away from the centre.

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