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Standard XII
Physics
Circular Kinematics
Question

A particle of mass M and positive charge Q, moving with a constant velocity u1=4^ims−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 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 →u2=2(√3^i+^j)ms−1. The correct statement(s) is (are)
  1. the direction of the magnetic field is -z direction
  2. the direction of the magnetic field is +z direction
  3. the magnitude of the magnetic field 50πM3Q units
  4. the magnitude of the magnetic field 100πM3Q units

A
the direction of the magnetic field is -z direction
B
the direction of the magnetic field is +z direction
C
the magnitude of the magnetic field 50πM3Q units
D
the magnitude of the magnetic field 100πM3Q units
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Solution
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Time period of circular motion T=2πMQB

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