In figure, AB is a non‐conducting rod. Equal charges of magnitude 
are fixed at various points on the rod as shown. The rod is rotated uniformly about an axis passing through 
and perpendicular to its length such that linear speed of the end 
or 
of the rod is 3 
. Magnetic field at 
is:
Text Solution
Verified by ExpertsA
Since the rod is a rigid body, every point has same angular velocity 
For points at a distance of 1 
For points at a distance of 2 
If a charge rotating in a circle constitutes a current 1, 
, where i 
Since field due to rotation of all charges are in same direction
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