Pat Mistakes/ New Info

Question 1

Remember for two parallel currents to increase magentidim in middle what must direction if current be

Answer 1

Opposite, so field lines supoerpose and increase density!

Question 2

How to improve appraisal designed ti suffer parallel shifts so you can calculate refractive index. How does it work anyways

Answer 2

You increase angle until no exit angle, you know tir is observed

At this point can rearrange equations to find a refractive index provided you know one

Question 3

How ti improve refractive index practicals

Answer 3

Replace air with vacuum to accurately get a known constant refractive index
- record output intensity with quantified detector rather than eye
- use monochromatic Light to avoid dispersion as it refracts and angle increases

Question 4

Remember grav fields where the force coming from if got multiple masses EVEN IF STRAIGHT LINE

Answer 4

Even if straight line a mass will experience grav force from ALL masses
- vector addition , remember

Question 5

If a downer is conducting where is all the charge and thus what can you cisndier it as

Answer 5

All charge in centre, thus point charge

Question 6

Remember if needed in parametric functions what can you replace angle theta with

Answer 6

Omega t

Question 7

In the particle fileterinf thing how do you formulate equations using all three fields

Answer 7

Gravity field acts down
Electric field firce work out based in charge
MAGENTIC field force work out based on Fleming left

Now must be 0 resultant force so equate the forces based so their directions cancel out

And rearrange

Question 8

How to derive a suvst equation form INITAL assumption that a is constant?

Answer 8

Integrate a ti give velocity with respect to time
Constsnt if c = t is 0 when v is 0

Again
C = t=0 and s =0

Should get s= ut + 1/2at2