Turn on thread page Beta
    • Thread Starter

    There is a question in the AQA Physics A2 book, done by jim breithaupt, chapter 5.2 question 2a)

    Ill try explain it as best as i can but it has a diagram... Anyway.

    It says figure 6 shows the path of a charged dust particle in an electric field.
    Figure 6 is a path of a dust particle curving away from the metal that is under a electric field. The line of force is going away from the metal. so the dust particle is curving towards the line of force.
    a) the electric field strength at X is 65kVm^-1. The force due to the field on the particle when it is at X is 8.2x10^-3N towards the metal surface.
    i) what type of charge does X carry.

    I said that it was positive because line of force on a charged object always goes from positive to negative, and due to the force being towards the metal and the fact that the dust particle in the diagram is bending away from the metal, i would have thought it was positive. But... its negative, and i havent a clue why.
    •  Official Rep

     Official Rep
    Sorry you've not had any responses about this.

    Why not try posting in a specific subject forum- you might have more luck there.

    Here's a link to our subject forum which should help get you more responses.


    Im doing this question now and I think its definitely positively charged - the answer in the book must be wrong?!

    also, the next part of the question asks for the charge it carries and the answer in the book doesnt specify its negatively charged so not sure...

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
How are you feeling in the run-up to Results Day 2018?
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

Groups associated with this forum:

View associated groups

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

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