Need an explanation.. I have the answer.. if you could help with any one that\'d

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Need an explanation.. I have the answer.. if you could help with any one that'd be great.

Each plate of a parallel-plate air capacitor has an area of 0.0040 m 2, and the separation of the plates is 0.080 mm. An electric field of 5.3 times 10 6 V/m is present between the plates. The energy density between the plates is closest to: 210 J/m 3 250 J/m 3 130 J/m 3 84 J/m 3 170 J/m 3 An electron is released from rest at a distance of 9 cm from a proton. How fast in m/s will the electron be moving when it is 3 cm from the proton? 75 1.06 times 10 3 130 4.64 times 10 5 106 What is the electric field strength at x = 0 m, y = 0 m produced by two electrons, one at x = 0.0001 m, y = 0 m and the other at x = -0.0001 m, y = 0 m? (The value of k is 9.0 times 10 9 N middot m 2/C 2.) A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, the electrical force on 3Q is: F F/3 3F

Explanation / Answer

1. energy density u = 0.5 eo E^2 = 130 J/m^3

2. a = Eq/m   and v^2 = 2aS = 106 m/s

3. charge are palced at equidistant and wxerts sameEFs in opposite drection, then E net = 0

4. force exert on one particle on to the other wll be same , so F1 =F2 = F

all ur answer were correct

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