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## PowerPoint Slideshow about ' Magnetism' - tanek

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It represents the effect a magnet has on its surroundings.

All magnetic fields arise from the motion of electric charge.

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

A magnetic field is represented by the symbol

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.

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

The Magnetic Force Right Hand Rule (RHR)

Figure 22-8The Magnetic Force Right-Hand Rule

Figure 22-9The Magnetic Force for Positive and Negative Charges

Conceptual Checkpoint 22-2Which is the positive? Negative? Zero charge?

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 22-3Which direction should the magnetic field be to give zero force?

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

Figure 22-11The Electromagnetic Flowmeter

Figure 22-12Circular Motion in a Magnetic Field

Example 22-3Uranium Separation

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

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

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

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

Figure 22-15The Magnetic Force on a Current-Carrying Wire

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

Figure 22-16Magnetic Forces on a Current Loop

Example 22-5Torque on a Coil

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

- 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 22-19The Magnetic Field of a Current-Carrying Wire

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