In the figure below, the electric field at point P is directed upward along the
ID: 1950088 • Letter: I
Question
In the figure below, the electric field at point P is directed upward along the y-axis. If a negative charge -Q is added at a point on the positive y-axis, what happens to the field at P? (All of the charges are fixed in position.)
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(a) Nothing since -Q is on the y-axis.
(b) Strength will increase because -Q is negative.
(c) Strength will decrease and direction may change because of the interactions between -Q and the two negative q's. .
(d) Strength will increase and direction may change because of the interactions between -Q and the two negative q's.
(e) Cannot determine without knowing the forces -Q exerts on the two negative q's.
The figure below shows a hollow conducting metal sphere which was given initially an evenly distributed positive (+) charge on its surface. Then a positive charge +Q was brought up near the sphere as shown. What is the direction of the electric field at the center of the sphere after the positive charge +Q is brought up near the sphere?
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(a)Left
(b)Right
(c)Up
(d)Down
(e)Zero field
PLEASE Some explaniation....
Explanation / Answer
the resultant of the electric field by the two negative charges will be along y-axis
since Q is also a negative charge the electric field direction is also along y-axis and in the same direction of the resultant of the fields obtained by the -q charges
therefore the strength increases
so answer is (b)
2.)òE·ds = Qin/o -gauss law
as charge enclosed is zero there will be zero electric field at the centre
as because of +Q charge there will be non-uniform distribution on the surfece of the conductor