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Magnetism. Magnetic field- A magnet creates a magnetic field in its vicinity. Magnetism. It represents the effect a magnet has on its surroundings. Magnetism. All magnetic fields arise from the motion of electric charge. Magnetism.

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Magnetism

Magnetic field-

A magnet creates a magnetic field in its vicinity.


Magnetism

It represents the effect a magnet has on its surroundings.


Magnetism

All magnetic fields arise from the motion of electric charge.


Magnetism

Magnetic field lines can be used to represent magnetic fields.

The closer the lines are together, the greater the magnitude of the vector


Figure 22 4 magnetic field lines for a bar magnet
Figure 22-4 Magnetic Field Lines for a Bar Magnet


Magnetism

A magnetic field is represented by the symbol


Magnetism

The direction of a magnetic field

at a given location is the direction in which the north pole of a compass points when it is placed in that location.


Magnetism

A charged particle moving in a magnetic field will experience a force if it has a velocity component perpendicular to the magnetic field.



Magnetism

The Magnetic Force Right Hand Rule (RHR)



Figure 22 8 the magnetic force right hand rule
Figure 22-8The Magnetic Force Right-Hand Rule


Figure 22 9 the magnetic force for positive and negative charges
Figure 22-9The Magnetic Force for Positive and Negative Charges


Conceptual checkpoint 22 2 which is the positive negative zero charge
Conceptual Checkpoint 22-2Which is the positive? Negative? Zero charge?


Magnetism

Velocity selector.

A device with both magnetic and electric fields present. Only charged particles moving with a certain speed will pass through undeflected.



Conceptual checkpoint 22 3 which direction should the magnetic field be to give zero force
Conceptual Checkpoint 22-3Which direction should the magnetic field be to give zero force?


Magnetism

A charged particle moving with a velocity perpendicular to a uniform magnetic field, will move in a circle.


Figure 22 11 the electromagnetic flowmeter
Figure 22-11The Electromagnetic Flowmeter





Figure 22 12 circular motion in a magnetic field
Figure 22-12Circular Motion in a Magnetic Field


Example 22 3 uranium separation
Example 22-3Uranium Separation


Magnetism

  • Forces on a long straight current carrying wire in a magnetic field.


Magnetism

  • Forces on a long straight current carrying wire in a magnetic field.


Magnetism

  • A long straight current carrying wire has charges moving inside it.


Magnetism

  • If it is placed in a magnetic field, it will experience a force




Figure 22 15 the magnetic force on a current carrying wire
Figure 22-15The Magnetic Force on a Current-Carrying Wire


Magnetism

  • Direction of magnetic forces in a current carrying loop in a magnetic field.


Figure 22 16 magnetic forces on a current loop
Figure 22-16Magnetic Forces on a Current Loop


Example 22 5 torque on a coil
Example 22-5Torque on a Coil




Magnetism

  • To calculate the magnitude and direction of the magnetic field in the vicinity of a long straight current carrying wire.


Magnetism

  • Apply the magnetic field right hand rule.

  • Point your thumb in the direction of current flow.

  • Curl your fingers around the wire

  • They will point in the direction of the magnetic field.


Figure 22 19 the magnetic field of a current carrying wire
Figure 22-19The Magnetic Field of a Current-Carrying Wire




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