MAGNETIC FIELD by Giuseppe

LORENTZ FORCE

virgy_2 — 2017-05-26 14:09:25 UTC

virgy_2 — 2017-05-26 14:16:52 UTC

virgy_2 — 2017-05-26 14:18:32 UTC

It's employed by a magnetic field on a charge q with a speed v.
Its modul is F=qvBsena , a is the corner between v and B.
Its direction is perpendicular to the plane defined by vectors v and B
Its verse is given by the law of the right-hand: if the charge is positive, you have to direct your thumb to the speed; if it's negative, you have to direct your thumb in the opposite verse of v.
You can modify the direction of the charge, but you can't change speed's value, because it's perpendicular to charge movement.

ELECTRIC AND MAGNETIC FORCE

virgy_2 — 2017-05-26 15:05:54 UTC

HALL'S EFFECT

virgy_2 — 2017-05-26 15:06:16 UTC

A foil crossed by current is put in a magnetic field and the direction of the curren is perpendicular to the one of the field; between foil's border you can calculate a potential difference caused by the Lorentz force that act on charge

HALL TENSION

virgy_2 — 2017-05-26 15:14:43 UTC

The tension is directly proportional to the magnetic field. The width of the foil and the speed are costant
V_H=dvB

A CHARGE MOTION IN AN UNIFORM MAGNETIC FIELD

virgy_2 — 2017-05-26 15:21:15 UTC

v perpendicular to B

virgy_2 — 2017-05-26 15:22:24 UTC

It's a uniform circular motion
The radius is given by the formula: r=mv/ |q|B
The period is equal to T= 2(3.14)m/ |q|B

v oblique to B

virgy_2 — 2017-05-26 15:31:03 UTC

It's a cylindrical helix with costant motion
The radius is equal to r=mv/ |q|B
Motion is equal to: S= [2(3.14)m/ |q|B] v_||

SPECIFIC ELECTRON CHARGE

virgy_2 — 2017-05-26 15:54:21 UTC

It's the ratio between the elementary charge e, equal to the one of the electron, and its mass
e/m_e

MAGNETIC FIELD VECTOR'S FLUX

virgy_2 — 2017-05-26 15:59:42 UTC

If the area is plain and the electric field is uniform: if it is positive field's lines exit from the positive side, if they're negative they enter into the electric field: Φ_s(B) = B S = BS cos α

MAGNETISM GAUSS THEOREM

virgy_2 — 2017-05-26 16:06:36 UTC

The magnetic field's flux thruogh every surface is null: Φ_Ω(B) = 0

MAGNETIC FIELD'S CIRCUITATION

virgy_2 — 2017-05-26 16:10:48 UTC

Γ_L(B) = ∑ B_j ∆l_j

AMPERE'S THEOREM

virgy_2 — 2017-05-26 16:11:19 UTC

Γ_L(B) = µ₀ ∑ i_k