NCERT Based Test: Motion in Combined Electric & Magnetic Fields - NEET MCQ
15 Questions MCQ Test - NCERT Based Test: Motion in Combined Electric & Magnetic Fields
A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields 
with a velocity 
perpendicular to both 
, and comes out without any change in its magnitude or direction. Then
with a velocity perpendicular to both , and comes out without any change in its magnitude or direction. Then 
are perpendicular and velocity has no change then qE = qvB i.e. v= E/B. The two forces oppose each other so, v is along 
i.e., 
.
are perpendicular to each other 
A charged particle would continue to move with a constant velocity in a region wherein, which of the following conditions is not correct?
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The cyclotron frequency vc is given by
A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the radio frequency field is doubled?
A cubical region of space is filled with some uniform electric and magnetic field. An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity - v. At this instant, which one of the following is not correct?
A cyclotron is operated at an oscillator frequency of 12 MHz and has a dee radius R = 50 cm. What is the magnitude of the magnetic field needed for a proton to be accelerated in the cyclotron?
If an electron is moving in a magnetic field of 5.4 x 10-4 T on a circular path of radius 32 cm having a frequency of 2.5 MHz, then its speed will be
A proton and an α-partide enter in a unifoi magnetic field perpendicularly with same speed. The ratio of time periods of both particle (TP/Tα) will be
A proton, a deutron and an α-particle with same, kinetic energy enter perpendicularly in a uniform magnetic field, then the ratio of radii of their circular paths is
∴ r ∝ √m/q
If an electron enters with a velocity 
into a cubical region in a uniform electromagnetic field and the orbit of the electron is found to spiral down inside the cube in plane parallel to x-y plane then the configuration of electric field and magnetic field is
must be along +z direction and 
should be along x−axis.
The energy of emergent protons in MeV from a cyclotron having radius of its dees 1.8 m and applied magnetic field 0.7T is (mass of proton = 1.67×10−27 kg):
Which of the following is not correct about cyclotron?
The operating magnetic field for accelerating protons in a cyclotron oscillator having frequency of 12 MHz is (q = 1.6 x 10-19C, mp = 1.67 x 10-27 kg and 1 MeV = 1.6 x 10-13 j)
In the question number 34, the kinetic energy (in MeV) of the proton beam produced by the accelerator is (radius of dees = 60 cm)
An electron is moving in a cyclotron at a speed of 3.2 x 107 m s-1 in a magnetic field of 5 x 10-4 T perpendicular to it. What is the frequency of this electron?
(q = 1.6 x 10-19 C, me = 9.1 x 10-31 kg)
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