Electrical Potential Question
Can someone please explain to me how you solve question 15 on this paper? Thanks
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-QP-JUN14.PDF
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-QP-JUN14.PDF
Original post by Dentist95
Can someone please explain to me how you solve question 15 on this paper? Thanks
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-QP-JUN14.PDF
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-QP-JUN14.PDF
The electric potential is the work done in moving a unit charge to a location, from infinity, in an electric field. For a charge :
where is a constant and is the distance from the unit charge to .
Here we have to consider the electric potential due to two charges . It turns out that we simply add the potentials for each i.e. they obey the principle of superposition (if one was -ve, we'd have to take account of that though via setting the charge to )
We are interested in the line from P to Q. Let be the distance from P to the location of the unit charge. Then and the total potential as a function of due to the two charges is:
You know that at the central point, and . You should be able to do the rest.
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