The next four questions refer to the figure shown to the right, in which four po

Question

The next four questions refer to the figure shown to the right, in which four point charges are arranged in a diamond and are fixed in space. What is the electrical potential at point A? A) - kq/2d b) - kq/d c) zero e) none of the above What is the electrical potential energy of the system of four charges? a) zero b)- kq^2/d b) - kq^2/2d c) + kq^2/d e) none of the above What is the magnitude of the net electric field at point A? a) kg/d^2 b) kq/2d^2 c) - kq/4d^2 d) kq/4d^2 e) none of the above Suppose a negative point charge, -Q, is placed at point A. When -Q is released, in which direction will it move? Use the direction wheel shown to the right and choose the direction that most closely agrees with the actual direction of movement. a) VIII b) VII c) V d) II e) III

Explanation / Answer

6) b) -k*q/d

because, the potential due to a postive and negative charges are equal in magnitude but with opposite sign.

7) a) zero

use, V = k*q1*q2/r for all combination of charges.

8) b) k*q/(2*d^2)

when we add electric field vectors by all the charges, we get above value.

9) e) III

because, a negative charge always atrracted towards opposite to the electric field.

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