An "α" particle enters a magnetic field of strength "B" with a speed "v" parallel to the direction of the magnetic field. The force on the particle is:
Correct answer: D. Zero
- A. Bev
- B. Bev/2
- C. Infinite
- D. Zero
Explanation
The magnetic force is given by F = qvBsinθ, where θ is the angle between velocity and the magnetic field. Since the particle's motion is parallel to the field, the angle θ is 0°. As sin(0°) = 0, the force on the particle is zero.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
Practise Electromagnetism
1,176 free Electromagnetism MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electromagnetism questions
Force acting on a moving charge in a magnetic field will not depend on:
When a charged particle enters a magnetic field at an angle of 45° , its path in the magnetic field will be:
At one instant an electron is moving in the positive x direction in a region where there is a uniform magnetic field in the positive z direction. When viewed from a point on the positive z axis, its subsequent motion is:
The magnetic field produced due to the current in a straight wire is proportional to the:
The magnetic field due to the electric current in a conducting straight wire is:
A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. The electron will: