Some questions after going through test papers (EDEXCEL)Watch
I approached this question first by going through their equations, so electric field strength = F/C, and force is a vector quantity so no. Momentum = mass x velocity, and velocity is a vector quantity so no.
I did not remember what the magnetic flux density equation was, but I know magnetic flux density has a direction because of the left hand rule business.. but at the same time I thought potential difference (voltage) is a vector quantity too for some reason, because of volt travels in a direction? It is carried by current in a direction.. I had to choose voltage in the end (which was right), but how can I approach questions like this better? How come potential difference is not a vector?
2) In the alpha scattering experiment, what does kinetic energy/velocity given to the alpha particles have to be the same? What does it have to do with how far they are deflected or whatever
Or in mathematical terms:
Potential Difference between two points to be given by,
This definition of Potential Difference between points A and B does not say anything about the actual value VA and VB so we can apply an arbitrary offset to each without effecting any results. It is conventional to define a point at ∞ having a Potential of zero, so V∞=0, so the Potential of a point A is given by
where W∞A is the work done by an external agent to take a charge q0 from infinity to the point A. Using the definition of W we therefore have that,