Jee Main
Magnetic Properties Of Matter
JEE Main 2025 (Online) 28th January Evening Shift
MCQM+4 / -12025
A bar magnet has total length $2 l=20$ units and the field point P is at a distance $\mathrm{d}=10$ units from the centre of the magnet. If the relative uncertainty of length measurement is $1 \%$, then uncertainty of the magnetic field at point P is :