Lecture6a

# Lecture6a - Phy7CC/D: Lecture6:FieldModel Electric Fields...

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Phy 7C C/D: Lecture 6: Field Model Electric Fields and Forces

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Scalar Field
Vector Field

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Vector Line Plot
Equipotential

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Field Model: Electric Fields A source charge q 1 creates an electric field E q1 . Direction is toward negative charge OR away from positive charge . Magnitude is | E q1 | = kq 1 /r 2 The net field E tot is the vector sum of all the source fields. A test charge q 2 , placed in an electric field E tot , experiences an electric force Magnitude given by: | F on q2 |= |q 2 E tot | . Direction of force is: for q 2 positive: same direction as E tot for -q 2 negative: opposite E tot . - +
Electric Fields from Multiple Charges:  Superposition - + The + and - charges have the same magnitude. Which direction does the net Electric Field point at the marked spot?

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Electric Fields from Multiple Charges:  Superposition - + 1 2 3 4 5 6 7 E tot = 0 8 Not enough Info The + and - charges have the same magnitude. Which direction does the net Electric Field point at the marked spot?
Checking Understanding - + 1 2 3 4 5 6 7 F = 0 8 Not enough Info A charge is placed at the marked location. What is the direction of the force exerted on the charge?

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Electric Field Lines Direction of field line at any point tells us the direction of the field at that point Density of field lines at any point tells us the relative strength of the field at that point What do the field lines tell us about the direction of the field at the marked point?
At which point is the magnitude of the electric field the largest? 1) The

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## Lecture6a - Phy7CC/D: Lecture6:FieldModel Electric Fields...

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