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

Magnetism


Observe

Observe:

N

S

N

S

Attract or repel?


Observe1

Observe:

S

N

N

S

Attract or repel?


Observe2

Observe:

N

S

S

N

Attract or repel?


Observe3

Observe:

N

S

N

S

Attract or repel?


Observe4

Observe:

N

S


Make a map of the magnetic field around the bar magnet

Make a map of the magnetic field around the bar magnet

N

S


Magnetism

Make a map of the magnetic field around the horseshoe magnet

S

N


Try this

Try this.


Try this1

Try this.

What does the current in the wire do?


The magnetic field b

The magnetic field, B

B

S

N


A current makes a magnetic field

A current makes a magnetic field

I

B


A current makes a magnetic field1

A current makes a magnetic field

I

I

B

B

  • This is called the right hand rule


Fields

Fields

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


Fields1

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.


Fields2

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.


Fields3

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

Oddly enough…

Electrical and magnetic fields can attract and repel.

Gravitational fields seem to only attract


The relationship between electricity and magnetism

The relationship between electricity and magnetism

A moving charge affects a magnet

A moving magnet affects a charge


The relationship between electricity and magnetism1

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 magnetism2

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 magnetism3

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 magnetism4

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 magnetism5

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

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.


Electromagnets1

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

Solenoid

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


Solenoid1

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

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?


Which direction is the force on the wire1

Which direction is the force on the wire?

  • Use the right hand rule !


Magnetism

  • B = the magnetic field =index finger

  • F = force on the wire =palm

  • I = the (+) current=thumb


Magnetism

  • F = force on the wire =palm

  • I = the (+) current=thumb

  • B = the magnetic field =index finger


What is the missing vector

What is the missing vector ?

I

B


What is the missing vector1

What is the missing vector ?

I

B


Mechanical energy electrical energy

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 energy1

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 energy2

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


Magnetism

1

2

3

4

5

6


Magnetism

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


Magnetism

  • B = the magnetic field =index finger

  • EMF = force on the charge

  • =palm

  • v = velocity of moving wire=thumb


What is the missing vector2

What is the missing vector ?

v

B


What is the missing vector3

What is the missing vector ?

v

B


What is the missing vector4

What is the missing vector ?

EMF

v


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