DAY 25

DAY 25Electric Fields

What is an Electric Field? Who cares?

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What is an Electric Field? Who cares?

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Constructing the Electric Field

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Constructing the Electric Field

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Constructing the Electric Field

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The Electric Field of a Point Charge

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The Electric Field model

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Superposition of Electric fields

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Determine the magnitude and the direction of the electric field at point A.

Example Problem

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Dipole Electric Fields

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Field lines

Electric Field Lines

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Uniform Electric Fields

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Cathode ray tube

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Examples

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a. The CRT (cathode ray tube) needs the electrons to exit with speed 6E7 m/s. What electric field strength is necessary?

b. A uniform electric field of 1.5E5 N/C is used to deflect the beam. What angle?

Conductors and Electric Fields

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Conductors and Electric Fields

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A positively charged (non-metallic) sphere is places over a metal plate with anet negative charge.

Conductors and Electric Fields

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A positively charged (non-metallic) sphere is places over a metal plate with anet negative charge.

Forces and Torques on Charges in Electric Fields

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