A particle of mass M and positive charge Q , moving with a constant velocity enters a…
Physics · JEE Advanced · NTA Exams — Magnetic Effects of Current and Magnetism
A particle of mass M and positive charge Q, moving with a constant velocity 
enters a region of uniform static magnetic field normal to the x-y plane. The region of the magnetic field extends from x = 0 to
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 \(\vec{u}_{2}=2(\sqrt{3 i}+\hat{j}) \mathrm{m} \mathrm{~s}^{-1} .\) The correct statement(s) is (are).
enters a region of uniform static magnetic field normal to the x-y plane. The region of the magnetic field extends from x = 0 to 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 \(\vec{u}_{2}=2(\sqrt{3 i}+\hat{j}) \mathrm{m} \mathrm{~s}^{-1} .\) The correct statement(s) is (are).
- The direction of the magnetic field is –z direction.
- The direction of the magnetic field is +z direction.
- The magnitude of the magnetic field
units. - The magnitude of the magnetic field is
units.
Answer
(B) The direction of the magnetic field is + z direction.
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