# Magnatic lecture

72

A mind map for magnatic lecture. A magnet is an object (generally a metal) that has a north and south pole, such that opposite poles attract and like poles repel. A magnet contains electrons that have both uneven orbits and uneven spins.

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magnatic lactures

Magnetic Fields

Magnetic Field Lines

the direction of the tangent to a magnetic field line at any point gives the direction of B at that point .

the spacing of the lines represents the magnitude of B the magnetic field is stronger where the lines are closer together.

Experiments

The magnitude and direction of FB depend on the velocity and on the magnitude and direction of the magnetic ﬁeld

When a charged particle moves parallel to the magnetic ﬁeld vector, the magnetic force acting on the particle is zero

The magnitude and direction of FB depend on the velocity of the particle and on the magnitude and direction of the magnetic ﬁeld B.

magnetic field is vector quantity

the IS unit of manatic field is Tesla (T)

Induction and Inductance

Faraday’s law of Induction

An emf is induced in a loop each time the magnetic field changes

The law states that an emf is induced in the loop each time the number of magnetic field lines that pass through it changes.

Magnetic Flux

Lenz’s Law

This law is used to find the direction of the induced current:

the direction of the induced emf is the same as the direction of the induced current.

Inductors and Inductance

Subtopic

Alternating Current

1- Resistive Load

XR= R

2- Capacitive Load

3- Inductive Load

iLand vL are 90° out of phase.

The Series RLC Circuit

Transformers

Magnetic Fields due to Currents

experimental observations:

The vector dB is perpendicular to ds and to unit vector directed from ds toward P.

The magnitude of dB is inversely proportional to r2

The magnitude of dB is proportional to the current and to the magnitude ds of the length element ds.

The magnitude of dB is proportional to sin

Biot–Savart law:

RL Circuits