Electrical Charges and Fields: Concepts and Relationships
Explore various concepts related to electrical charges and fields, including force directions, vector relationships, Coulomb's law, and point-to-point calculations. Understand how charges interact and affect electric fields in different scenarios.
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Presentation Transcript
Two charges +Q and -Q are fixed a distance r apart. The direction of the force on a test charge -q at A is y A.Up B.Down C.Left D.Right E.Some other direction, or F =0 +Q r 60o . A r 30o x r -Q 1
Two charges +q and -q are on the y- axis, symmetric about the origin. Point A is an empty point in space on the x- axis. The direction of the E field at A is y +q A.Up B.Down C.Left D.Right E.Some other direction, or E = 0, or ambiguous A x -q 2
How is the vector related to r1 and r2? 12 12 r1 = + A) r r r2 12 1 2 = - B) r r 12 1 2 = - C) r r 12 2 1 D) None of these 3
F(by 1 on 2) = kq1q2 2 12 Coulomb's law: 12 In the fig, q1 and q2 are 2 m apart. Which arrow can represent A 12 ? q1 q2 B C D) More than one (or NONE) of the above E) You can't decide until you know if q1 and q2 are the same or opposite signed charges4
1 What is ("from 1 to the point r") here? r1=(x1,y1) 1=r-r1 A = A /|A| A) (x-x1, y-y1) B) (x1-x, y1-y) -q +q r=(x,y) (x-x1, y-y1) ) (x1-x, y1-y) ) ( C) D) ( ) ( ( ) 2+ y-y1 2 2+ y-y1 2 x-x1 x-x1 E) None of these 5
