A bar magnet has total length 2l = 20 units and the field point P… | JEE Main 2025 Physics PYQ

MCQMediumJEE Main 2025 · 28 January, Shift 2Significant Figures & Error Analysis

A bar magnet has total length $2l = 20$ units and the field point $P$ is at a distance $d = 10$ units from the centre of the magnet. If the relative uncertainty of length measurement is $1\%$ , then the uncertainty of the magnetic field at point $P$ is:

A horizontal bar magnet with south pole on the left and north pole on the right, total length marked as 2l, and a point P vertically above the centre at distance d.

A
$10\%$
B
$4\%$
C
$5\%$
D
$3\%$

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