Part A Determine magnitude of the electric field at the point P shown in the fig
ID: 1586232 • Letter: P
Question
Part A
Determine magnitude of the electric field at the point P shown in the figure(Figure 1) . The two charges are separated by a distance of 2a. Point P is on the perpendicular bisector of the line joining the charges, a distance x from the midpoint between them.
Express your answer in terms of Q, x, a, and k.
E=???
Part B
Determine the direction of the electric field. Assume that the positive x and y axes are directed to the right and upward respectively.
A - in the negative x direction
B - in the positive x direction
C - in the positive y direction
D - in the negative y direction
+QExplanation / Answer
The components of the Electric field along Y axes gets cancelled because of symmetry
Only the X componentsw gets added up, since both will be along -X axis
E = E1x+E2x
Here the distance between charge and point is sqrt(a^2+r^2)
E = E1x+E2x
E = k Q/(a^2+r^2)+k Q/(a^2+r^2)
E = 2k Q/(a^2+r^2)
DIRECTION is ALONG negative X direction