Magnetism
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Magnetism. Observe:. N. S. N. S. Attract or repel?. Observe:. S. N. N. S. Attract or repel?. Observe:. N. S. S. N. Attract or repel?. Observe:. N. S. N. S. Attract or repel?. Observe:. N. S. Make a map of the magnetic field around the bar magnet. N. S.

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Magnetism

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Magnetism


Observe:

N

S

N

S

Attract or repel?


Observe:

S

N

N

S

Attract or repel?


Observe:

N

S

S

N

Attract or repel?


Observe:

N

S

N

S

Attract or repel?


Observe:

N

S


Make a map of the magnetic field around the bar magnet

N

S


Make a map of the magnetic field around the horseshoe magnet

S

N


Try this.


Try this.

What does the current in the wire do?


The magnetic field, B

B

S

N


A current makes a magnetic field

I

B


A current makes a magnetic field

I

I

B

B

  • This is called the right hand rule


Fields

  • If you put a ______ in a __________ field, it will experience a force.


Fields

  • If you put a ______ in a __________ field, it will experience a force.

  • If you put a mass in a gravitational field, it will experience a force.


Fields

  • If you put a ______ in a __________ field, it will experience a force.

  • If you put a mass in a gravitational field, it will experience a force.

  • If you put a charge in an electrical field, it will experience a force.


Fields

  • If you put a ______ in a __________ field, it will experience a force.

  • If you put a mass in a gravitational field, it will experience a force.

  • If you put a charge in an electrical field, it will experience a force.

  • If you put a magnetin a magnetic field, it will experience a force.


Oddly enough…

Electrical and magnetic fields can attract and repel.

Gravitational fields seem to only attract


The relationship between electricity and magnetism

A moving charge affects a magnet

A moving magnet affects a charge


The relationship between electricity and magnetism

A moving charge affects a magnet

… it makes a magnetic field

A moving magnet affects a charge

… it makes an electrical field


The relationship between electricity and magnetism

A moving charge affects a magnet

… it makes a magnetic field

A moving magnet affects a charge

… it makes an electrical field

  • There is an application of the right hand rule for each of these


The relationship between electricity and magnetism

A stable magnetic field affects a charge…

A stable electrical field affects a magnet…


The relationship between electricity and magnetism

A stable magnetic field affects a charge…

… only if the charge is moving

A stable electrical field affects a magnet…

…only if the magnet is moving


The relationship between electricity and magnetism

A stable magnetic field affects a charge…

… only if the charge is moving

A stable electrical field affects a magnet…

…only if the magnet is moving

  • There is an application of the right hand rule for each of these


Electromagnets

  • A coil of wire, carrying a current makes a magnetic field.

  • If you put the coil around a piece of iron or steel, it becomes an electromagnet.


Electromagnets

  • A coil of wire, carrying a current makes a magnetic field.

  • If you put the coil around a piece of iron or steel, it becomes an electromagnet.

  • Where could you use an electromagnet?


Solenoid

If a magnet can move into and out of the coil, it is called a solenoid.


Solenoid

If a magnet can move into and out of the coil, it is called a solenoid.

  • Where could you use a solenoid?


Electric motors

  • An electric motor converts electrical energy into work, usually rotational motion.

  • Usually, a magnet makes coil of wire rotate when a current is flowing.


Which direction is the force on the wire?


Which direction is the force on the wire?

  • Use the right hand rule !


  • B = the magnetic field =index finger

  • F = force on the wire =palm

  • I = the (+) current=thumb


  • F = force on the wire =palm

  • I = the (+) current=thumb

  • B = the magnetic field =index finger


What is the missing vector ?

I

B


What is the missing vector ?

I

B


Mechanical Energy Electrical Energy

Motors

--Convert electrical energy into mechanical energy

--An electric current causes a coil of wire to spin in a magnetic field

--The rotational motion can do many jobs


Mechanical Energy Electrical Energy

Generators

--Convert mechanical energy into electrical energy

--A coil of wire spinning in a magnetic field causes an electric current

--There are many ways to spin the generator


Mechanical Energy Electrical Energy

Motors

--Convert electrical energy into mechanical energy

--An electric current causes a coil of wire to spin in a magnetic field

--The rotational motion can do many jobs

Generators

--Convert mechanical energy into electrical energy

--A coil of wire spinning in a magnetic field causes an electric current

--There are many ways to spin the generator


1

2

3

4

5

6


Mechanical Energy Electrical Energy

Generator: If you move the wire, the force is exerted on the charge

Motor: If you move the charge (a current), the force is exerted on the wire

  • I

  • B

  • B

  • EMF

  • Force


  • B = the magnetic field =index finger

  • EMF = force on the charge

  • =palm

  • v = velocity of moving wire=thumb


What is the missing vector ?

v

B


What is the missing vector ?

v

B


What is the missing vector ?

EMF

v


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