Two negative charges, Q = - 30 u uC are placed on the x-axis at x = + 0.5 m and

Question

Two negative charges, Q = -30 uuC are placed on the x-axis at x = +0.5 m and x = -0.5 m.

A. How much energy does it take to assemble these two charges?

B.You place an unknown charge on the y-axis at y = 1 m and find that the electric potential is 0 V at the origin. What is the unknown charge?

C.If you place a -3 uC

charge at the origin, what is the x-component of the force on it from the other three charges?

D.If you place a -3 uC

charge at the origin, what is the y-component of the force on it from the other three charges?

Explanation / Answer

A)energy=kq1q2/x

=9*10^9*30*30*10^-12/1

=8.1 J

B)let the charge be q.so,

-2*9*10^9*30*10^-6/0.5 + 9*10^9*q/1=0

or q=1.2*10^-4 C

C)x component = + 9*10^9*1.2*10^-4*3*10^-6/1^2

=3.24N (-i)

d)y component=0

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