SSC CHSL 2023 PYQ — Question 48

The correct answer is option 4 i.e. L_m = $\frac{5}{6}$ × Lg.

The correct relationship between geometric length (Lg) and magnetic length (Lm) in the context of a magnet is:

Lm = (5/6) × Lg.

This relationship is derived based on the difference between the geometric length (which refers to the actual physical length of the magnet) and the magnetic length (which refers to the effective length of the magnet in terms of its magnetic properties).

The magnetic length is typically shorter than the geometric length because of the distribution of the magnetic field within the material, and the pole strength's effective length is influenced by the magnetic field's characteristics, such as the demagnetizing effect. The factor of 5/6 accounts for this adjustment.