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# Physics AQA problem watch

1. 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.

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.

3. 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...

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