Two large parallel plates carry positive charge of equal magnitude that is distr

Question

Two large parallel plates carry positive charge of equal magnitude that is distributed uniformly over their inner surfaces. Rank the points l through 5 according to the magnitude of the electric field at the points, least to greatest. 1, 2, 3, 4, 5 5, 4, 3, 2, 1 1, 4, and 5 tie, then 2 and 3 tie 1 23 4 5 2 and 3 tie, then 1 and 4 tie, then 5 2 and 3 tie, then 1, 4, and 5 tie An unchanged metal sphere will be repelled by a charged metal surface. feel no force when brought close to a charged metal surface be attracted by a charged metal surface. not enough information Two identical conducting spheres A and B carry equal charge. They are separated by a distance much larger than their diameters. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to B, and finally removed. As a result, the electrostatic force between A and B, which was originally F. becomes:

Explanation / Answer

point1

E1 = sigma/e0

point 2 , 3

E2 = E3 = 0

poin4 , 5

E4 = E5 = sigma/ e0

2 and 3 tie, then 1 ,4 and 5 tie

OPTION E

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OPTION C

the charged sphere induces opposite on the near end of the uncharges sphere

the uncharges gets attracts to the sharges sphere

option (C)

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F = k*q^2/d^2

after touching to A

qA = q/2

qC = q/2

after touching to B

qc' = (qc + q)/2 = (q/2 + q)/2 = 3q/4

qB = 3q/4

F' = k*qA*qB/d^2

F' = k*q/2*3q/4/d2^2 = 3*k*q^2/(8d^2)

F' = (3/8)*kq^2/d^2 = 3F/8

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