please explain the following:

Asked by  | 1st Jun, 2009, 11:02: PM

Expert Answer:

correct answer is not indicated here due to some typo error. the solution for this problem is as follows:

let the charge at the origin be q. the force between the charge q and q1 is

f1 = k' q q1 / a2                                                                                

let k' = (1 / 4 x pi x episilon0)

the force between the charge q and q2 is

f2 = k' q q2 / (2a)2

since q1 = k q2

then    f1 = k' q k q2 / a2

f1 = 4 k f2

since the net force on origin is zero then

f1 + f2 = 0

4 k f2 + f2 = 0

k = - 1 / 4

Answered by  | 2nd Jun, 2009, 09:32: AM

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