Q. The magnetic field due to a short magnet at a point on its axis at distance $X\ cm$ from the middle point of the magnet is $200\ gauss$. The magnetic field at a point on the neutral axis at a distance $X\ cm$ from the middle of the magnet is
A) 100 $gauss$
B) 400 $gauss$
C) $50\ gauss$
D) $200\ gauss$
Explanation
(a) Along the axis of magnet $B_{a} = \frac{2M}{X^{3}} = 200\ gauss$
$\Rightarrow B_{a} = \frac{M}{X^{3}} = 100\ gauss$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.