Magnetic Fields

    • Thread Starter

    Why is a force exerted on a charged particle when it enters a magnetic field?

    (Original post by Hamza Rashid)
    Why is a force exerted on a charged particle when it enters a magnetic field?
    When a charge enters a magnetic field, the particle is attracted by the field lines of magnetic field. This has something to do with the charge of the particle. This attraction is the field force of the magnetic field and this exerted the force on charges.

    The force which is exerted on a charged particle in magnetic field is force = B*e*v. 'e' is the charge of the particle, a constant. 'v' is the velocity of the particle when the particle is moving in magnetic field. And last but not least, B is the flow density of magnetic field.*

    Say velcotiy is not changed, the force would depend on flow intensity of magnetic field (please note: if the velocity does really NOT changed). That is to say, the force is stronger the more homogen field lines exist. Homogen means that the field lines have the same distance to each other (means that the same field force exists everywhere in magnetic field).

    To sum up: higher flow density -> more (homogen) field lines in magnetic field -> stronger the magnetic field -> stronger the attraction to the charge -> stronger the force to particle.

    Hope that is helpful for you. **
Write a reply… Reply
Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: September 25, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Which is the best season?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni


Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Sponsored content:



Find out how a Higher Education Achievement Report can help you prove your achievements.

Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.