AQA Physics Unit 4 Thread - JAN 28th 2010 (Post Exam)

Could someone tell me what percentage of the paper is composed of multiple choice? Also, do we have both parts/sections of the paper to complete at the same time? If so then we can use both parts together which will help as some questions will have a slight overlap.

well if anyone has any questions, ask away!

Is damping always in the opposite direction to velocity or displacement? How do you know when to use which Fleming hand rule?

Flemings left hand rule is for converting electricity into motion. The right hand rule is for converting motion into electricity.
I'm fairly sure damping is always in the opposite direction to the velocity, as it is trying to reduce the velocity each cycle.

Oh, so when you are moving a magnet through an electric field, or a coil through a magnetic field, you use the right hand rule? And for the left hand rule you use it when?

But doesn't damping also oppose the amplitude of the oscillation, as this decreases with every cycle?

Thanks for the reply, +rep.

Is damping always in the opposite direction to velocity or displacement? How do you know when to use which Fleming hand rule?