An electron with a speed of 1.8 x 106 m/s is moving in a circular orbit in a uniform magnetic field of 10-4 Wb/m², the radius of the circular path of the electron is
  • 10.63 m
  • 1.063 m
  • 106.3 m
  • 0.1063 m
A particle of charge 1.6 x 10-19 C and mass 1.8 x 10-27 kg is moving around the path of radius 2 x 104 m with velocity 2.4 x 106 m/s. The magnetic field necessary is (in Wb/m²)
  • 13.5 x 10-6
  • 135 x 10-6
  • 0.135 x 10
  • 1.35 x 10-6
The force acting on a charge q moving with velocity in a magnetic field  is given by
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Magnetic-Lorentz-Force-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning.png
  • A
  • B
  • C
  • D
A Charge is fired through a magnetic field. The magnetic force acting on it is maximum when the angle between the direction of motion and magnetic field is
  • π
  • zero
  • π/2
  • π/4
The frequency () of charged particle, moving at right angles to the magnetic field is independent of
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  • radius of circular trajectory (r)
  • magnetic induction (B)
  • speed of the particle (v)
  • both speed of the particle (v) and radius of trajectory (r).
Two straight horizontal parallel wires are carrying the same current in same direction, d is the distnace between the wires. You are povided with a small freely suspended magnetic needle. At which of the following positions will the orientation of the needle be independent of the magnitude of current in the wires?
  • At a distance d/2 from any of the wires.
  • At a distance d/2 from any of the wires in the horizontal plane.
  • Anywhere on the circumference of a vertical circle of radius d ans centre half way between the wires.
  • At points half way between the wires in the horizontal plane.
A proton enters a magnetic field with a velocity of m/s making an angle of 30° with the field. What is the force experienced by the proton if B = 3.0 T.
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  • 3.6x10-14 N
  • 1.2x-14 N
  • 4.8x-14 N
  • 2.4x-14 N
When a charged particle moves in a magnetic field, its kinetic energy always
  • remain constant
  • first increases then decreases.
  • decreases
  • increases
A proton with 1MeV kinetic energy is moving in a circular path of radius R in a uniform magnetic field. What should be the energy of an α - particle to describe a circle of same radius in the same magnetic field?
  • 2 MeV
  • 0.5 MeV
  • 1 MeV
  • 4 MeV
An electron is moving in a circular orbit in a magnetic field Wb/m², the time period of electron is
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Magnetic-Lorentz-Force-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning1.png
  • A
  • B
  • C
  • D
0 h : 0 m : 1 s

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