Practice Problems on Electrical Field of Continuous Charge Distribution | PHYS 2120, Study notes of Physics

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Electric Field of a Continuous Charge Distribution

(Example)

Find the electric field a long wire holding a total charge of "q."

23.6 Electric Field Lines

Lines are tangent to E at every point (and tangent to F )

The # of lines per unit area is proportional the strength of E.

Lines will start on + charges and end on charges (or

start/end at infinity)

their direction is in the direction of E at any point

Lines are perpendicular to the surface of conductors

Lines can't cross one another.

You can figure out a field line by thinking of putting a small +

test charge in the field and seeing the direction of the force

on it.

Ch 24 Gauss' Law

24.1 Electric Flux

Define the electric flux, , as a measure of the # of

electric field lines penetrating a surface.

Note:

the flux = zero if E = 0 or if E is perpendicular to A.

the flux > 0 if E is "out of" the surface.

the flux < 0 if E is "into" the surface.

HW

• Ch 23 pp
• P 26, 27a,b, 39, 40,
• Ch 24 p
• P 3,

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