Magnetism

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# Magnetism - PowerPoint PPT Presentation

Magnetism. INEL 4151 Dr. Sandra Cruz-Pol UPRM. Applications . Motors Transformers MRI More…. H= magnetic field intensity [A/m] B = magnetic field density [ Teslas ]. Biot-Savart Law. States that:. Example . a 2. a f. a 1. r.

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## Magnetism

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### Magnetism

INEL 4151

Dr. Sandra Cruz-Pol

UPRM

Applications

Motors

Transformers

MRI

More…

H= magnetic field intensity [A/m]

B = magnetic field density [Teslas]

Biot-Savart Law
• States that:
Example

a2

af

a1

r

For an infinitive line filament with current I (a1=180o and a2=0o):

PE. 7.1 Find H at (0,0,5)

z

• Due to current in (figure):

where a1=90o and

(0,0,5)

1 y

10A

1

x

Ampere’s Law
• Simpler
• Analogous to Gauss Law for Coulombs
• For symmetrical current distributions
Ampere’s Law

We define an Amperian path where H is constant.

Infinitely long coaxial cable

z

Four cases:

1) For r<a

Infinitely long coaxial cable

z

Four cases:

2) For a<r<b

Infinitely long coaxial cable

Four cases:

3) For b<r<b+c

z

Infinitely long coaxial cable

Four cases:

4) For r>b+c