An electron (charge = -1.6 x 10^-19C) is moving at 3 x 10^5 m/s in the positive x direction. A magnetic field of 0.8 T is in the positive z-direction. The magnetic force on the electron is:
Correct answer: D. 4 x 10^-14N in the negative y direction
- A. 0
- B. 4 x 10^-14N in the negative z direction
- C. 4 x 10^-14N in the positive z direction
- D. 4 x 10^-14N in the negative y direction
Explanation
Magnetic force is given byF = BqVF = 0.8 x 1.6x10-19 x 3x105F = 3.84x10-14 round it of to 4x10-14 NUse Fleming's left-hand rule to determine direction.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
Practise Electromagnetic Induction
288 free Electromagnetic Induction 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 Electromagnetic Induction questions
There is a current of 25 A in a long straight wire. What is the flux density at a point 3 cm from the wire?
In an AC generator, AC reverses its direction _ times per second.
The magnetic field inside a long solenoid is:
A uniform electric field and magnetic field are parallel and point in the same direction. An electron with velocity "v" projected in the same direction will:
A proton and an alpha particle, both are moving with same initial velocity, perpendicular to uniform magnetic field of 1 T. Find the ratio of radii of circles described by the alpha particle and the proton.
A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that