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Class 12 Physics
Magnetic Charges And Magnetism Chapter 4
Quiz 1
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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
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10.63 m
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1.063 m
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106.3 m
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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)
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13.5 x 10-6
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135 x 10-6
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0.135 x 10
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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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A
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B
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C
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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
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π
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zero
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π/2
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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)
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magnetic induction (B)
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speed of the particle (v)
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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?
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At a distance d/2 from any of the wires.
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At a distance d/2 from any of the wires in the horizontal plane.
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Anywhere on the circumference of a vertical circle of radius d ans centre half way between the wires.
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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
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1.2x-14 N
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4.8x-14 N
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2.4x-14 N
When a charged particle moves in a magnetic field, its kinetic energy always
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remain constant
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first increases then decreases.
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decreases
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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?
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2 MeV
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0.5 MeV
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1 MeV
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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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A
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B
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C
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D
0 h : 0 m : 1 s
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