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Electric field at point p if p is on a bisector between two opposite charges

by zyphriss2
Tags: bisector, charges, electric, field, opposite, point
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zyphriss2
#1
Feb15-09, 05:58 PM
P: 18
1. The problem statement, all variables and given/known data
Determine magnitude of the electric field at the point P. 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.


2. Relevant equations
e=(kq)/(r^2)



3. The attempt at a solution
Top e=((8.99x10^9)*Q)/(tan^-1(a/x))
Bottom e=((8.99x10^9)*Q)/(tan^-1(a/x))

I just don't know how to determine the magnitude, and express my answer in terms of the given variables...i do know that the answer is in terms of q
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tiny-tim
#2
Feb16-09, 04:40 AM
Sci Advisor
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tiny-tim's Avatar
P: 26,157
Hi zyphriss2!
Quote Quote by zyphriss2 View Post
3. The attempt at a solution
Top e=((8.99x10^9)*Q)/(tan^-1(a/x))
Bottom e=((8.99x10^9)*Q)/(tan^-1(a/x))
oooh why so trigonmetric?
just use Pythagoras!


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