Chapter 28
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CHAPTER 28. Sources of Magnetic Field. Producing a magnetic field. Permanent Magnet. Current. Magnetic field due to currents. Right hand rule. View from the top. VIEW FROM THE SIDE. Biot-Savart Law. What if the wire isn’t straight?. Infinite Straight wire. P. I.

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CHAPTER 28

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Chapter 28

CHAPTER 28

Sources of Magnetic Field


Producing a magnetic field

Producing a magnetic field

Permanent Magnet

Current


Magnetic field due to currents

Magnetic field due to currents

Right hand rule


View from the top

View from the top


View from the side

VIEW FROM THE SIDE


Biot savart law

Biot-SavartLaw

What if the wire isn’t straight?


Infinite straight wire

Infinite Straight wire

P

I


Infinite straight wire cont

Infinite Straight wire (Cont.)

Strategy: write everything in terms of θ

P


Example addition of b fields

Example: Addition of B Fields

Find the B field at point P


Example addition of b fields1

Example: Addition of B Fields


Force between parallel currents

Force between parallel currents

What if the currents are in opposite directions?


Field and force

Field and Force


Magnetic field of a loop of current

MAGNETIC FIELD OF A LOOP OF CURRENT


Coil and bar magnet

COIL AND BAR MAGNET

The magnetic field produced by a coil is almost identical to that of a bar magnet.


Solenoids

Solenoids


Solenoids1

Solenoids

n: Number of turns per unit length

Unit of n: m-1=turns/m


Ampere s law

Ampere’s Law


Right hand rule again

Right hand rule, again


Long straight wire again

Long Straight Wire, again


Derivation b field inside a solenoid

Derivation: B Field inside a Solenoid


Applications

APPLICATIONS


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