## Motion of Charge In Magnetic Field - MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Motion of Charge In Magnetic Field. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. A proton and an Î±-particle, moving with the same velocity, enter into a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton and Î±-particle is

•  1 : 2
•  1 : 4
•  1 : 16
•  4 : 1

1 : 2

Q2. A particle of mass M and charge Q moving with velocity v describes a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is

•  BQv2Ï€R
•  (Mv2/R)2Ï€R
•  Zero
•  BQ2Ï€R

Zero

Q3. An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be

•  Straight line along the x-direction
•  A circle in the xz-plane
•  A circle in the yz-plane
•  A circle in the xy-plane

A circle in the xz-plane

Q4. Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is

•  4 : 3
•  2 : 3
•  3 : 1
•  1 : 4

4 : 3

Q5. A charged particle is at rest in the region where magnetic field and electric field are parallel. The particle will move in a

•  Straight line
•  Circle
•  Ellipse
•  None of these

Straight line

Q6. An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly then

•  Both will follow a helical path
•  Both will follow a parabolic path
•  All the statements are false

All the statements are false

Q7. Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field

•  Li2+
•  Electron
•  Proton
•  He+

Li2+

Q8. If cathode rays are projected at right angles to a magnetic field, their trajectory is

•  Ellipse
•  Circle
•  Parabola
•  None of these

Circle

Q9. When a charged particle enters in uniform magnetic field. Its kinetic energy

•  Remains constant
•  Increases
•  Decreases
•  Becomes zero

Remains constant

Q10. A charge of 1 C is moving in a magnetic field of 0.5 Tesla with a velocity of 10 m/sec. Force experienced is

•  5 N
•  10 N
•  0.5 N
•  0 N

5 N

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