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Q.
In an inertial frame of reference, the magnetic force on a moving charged particle is $ \vec{F}$ Its value in another inertial frame of reference will be
Moving Charges and Magnetism
Solution:
$ \vec{F}=q\left(\vec{V} \times\vec{B}\right)$
$\therefore F=qvB\, sin \,\theta$
which shows magnetic field is velocity dependent due to which it differs from one inertial frame to another.