JEE Advanced 2013 Paper 1 Physics Q13

Physics · Moving Charges & Magnetism

Problem

A particle of mass

M

and positive charge

Q

, moving with a constant velocity

\vec{u}_1=4\hat{\mathbf i}\,\mathrm{m\,s^{-1}}

, enters a region of uniform static magnetic field normal to the

x

y

plane. The region of the magnetic field extends from

x=0

x=L

for all values of

y

. After passing through this region, the particle emerges on the other side after 10 milliseconds with a velocity

\vec{u}_2=2(\sqrt{3}\hat{\mathbf i}+\hat{\mathbf j})\,\mathrm{m\,s^{-1}}

. The correct statement(s) is (are)