Magnetism Flashcards Preview

Electromagnetism > Magnetism > Flashcards

Flashcards in Magnetism Deck (17)
Loading flashcards...
1
Q

Lorentz Force

A

F^ = qv^ x B^

2
Q

Direction of the Lorentz Force

A

perpendicular to both v^ and B^

3
Q

Total Magnetic Force on a Current Element

A

F^ = (qv^ x B^)nAL = IL^ x B^

4
Q

Motion in a Magnetic Field

A
  • magnetic force is always perpendicular to the velocity of the particle
  • speed does not change, kinetic energy is constant
  • in a uniform magnetic field, motion is always circular
5
Q

Radius of the Motion of a Particle in a Magnetic Field

Equation

A

r = mv/Bq

6
Q

Cyclotron Frequency

Equation

A

f = qB / 2πm

7
Q

Cyclotron

Description

A
  • accelerates particles in a limited amount of space
  • alternating voltage applied between two ‘Dees’
  • particle is accelerated in a spiral
  • when it leaves at maximum radius its kinetic energy can be very large
8
Q

Cyclotron - Kinetic Energy

A

KE = mv² / 2 = q²B²r²/2m

9
Q

Describe the Magnetic Field of a Solenoid

A
  • a solenoid is a wire wound into a helix of closely spaced coils
  • it produces a strong, uniform magnetic field inside the coil
  • acts like a magnet
10
Q

Magnetic Field Due to a Current Loop

A

B = μ0I / 2R

11
Q

Magnetic Field Due to a Long Wire

A

B = μ0I/4πR (sinθ2 - sinθ1)

12
Q

Magnetic Field of an Infinitely Long Wire

A

B = μ0I/2πR

13
Q

Force per unit length exerted by a wire on a wire segment

A

dF1,2 / dl2 = μ0I1I2/2πR

14
Q

Magnetic Flux Equation (Integral)

A

Φ = ∫ B.n^ dA

15
Q

Weber Definition

A
  • unit of magnetic flux

- defined as magnetic flux density multiplied by area

16
Q

Magnetic Flux Equation

A

Φ = BAcosθ

where θ is the angle between the plane of the are and the plane of the field

17
Q

Faraday’s Law

A

-for a surface bounded by a conducting material, a change in magnetic flux induces an electromagnetic force in the opposite direction to the movement of the charge
ε = - dΦ/dt