AS Physics question - help please! Watch

This discussion is closed.
dinkymints
Badges: 12
Rep:
?
#1
Report Thread starter 14 years ago
#1
I'm sure this should be simple but I just can't seem to get it... any help would be much appreciated.


A shallow trough has the shape shown in the diagram (see attachment, sorry for bad quality!) and contains a liquid with positive and negative ions. Electrodes are fixed to the ends of the trough at A and D and connected to a battery. The width of the trough at A is twice the width of the trough at D.

Using I = nAvq, v is inversely proportional to A when the other variables stay the same, as they would, right? In one part of the question I worked out that the ions move twice as fast between C and D as between A and B. Is that correct?

Part of the q I'm majorly stuck on...

"Draw a graph of current against distance from A, to show how the average speed of the positive ions varies along the line ABCD".

I don't get how I can show the average speed by plotting this :confused:

Help please!!!!!!!!!!!
Attached files
0
X
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Lincoln
    Brayford Campus Undergraduate
    Wed, 12 Dec '18
  • Bournemouth University
    Midwifery Open Day at Portsmouth Campus Undergraduate
    Wed, 12 Dec '18
  • Buckinghamshire New University
    All undergraduate Undergraduate
    Wed, 12 Dec '18

Do you like exams?

Yes (166)
18.57%
No (543)
60.74%
Not really bothered about them (185)
20.69%

Watched Threads

View All