Electricity And Magnetism

Question 1

Diamagnetic vs Paramagnetic vs ferromagnetic:

Answer 1

• diamagnetic: all suborbitals filled > cannot be magnetized
• Paramagnetic: 1/2 suborbitals filled with random spin > overall no net dipole
  Weak attraction to mag fields, can be temp polarized only in presence external field
• ferromagnetic: unpaired electron stable, non-random spin and permanent magnet

Question 2

Unit of measurement for magnetism:

- what is 1 unit equal to

Answer 2

Tesla = N s / C m

• thus only exert force on moving charges
• 1 T = 10K gauss

Question 3

What is magnetism?

Answer 3

Produced by spin of elementary particles, usu electrons

Question 4

Magnetic Field Equation:

Answer 4

B = u(0) I / 2 pi r
R H rule:
- thumb: current 
- curled fingers: direction field
- tip: at you, X away from you (arrow flying away)

Question 5

Force charge thru magnetic field formula:

What would create zero value for this force?

Answer 5

F = qvBsin theta

- charge 0, ,velocity 0, magnetic field = 0, direction parallel thus sin = 0

Question 6

2nd right hand rule:

Answer 6

thumb: direction of charge
Fingers: direction of field
Palm: direction of force ( Pos = forward, neg = back)

Question 7

How does circular motion relate to uniform field/grav field of:

Answer 7

F(c) = mv^2 / r = qvB
r = mv/qB

Question 8

What is Lorentz force?

Answer 8

Summation electrical and magnetic field components

Question 9

What is the charge of an electron?

Answer 9

e = 1.6E-19

Question 10

What is Coulomb’s law?

- think grav force

Answer 10

F = k q1q2/r^2

Question 11

Force of Current carrying wire:

Answer 11

F = ILBsin theta