Three charges are at the corners of an isosceles triangle as shown in the figure

Question

Three charges are at the corners of an isosceles triangle as shown in the figure (Figure 1) . The 5.00 micro C charges form a dipole. A)Find the magnitude of the force the -10.00 charge exerts on the dipole. B)Find the direction of the force the -10.00microC charge exerts on the dipole.(Suppose that -axis directs to the top of the image.) C)For an axis perpendicular to the line connecting the -+5.00microC charges at the midpoint of this line, find the torque (magnitude) exerted on the dipole by the -10.00microC charge. D)Find the direction of the torque: Is it clockwise or counterclockwise?

Explanation / Answer

Relevant equations
1. Edipole=(1/40)(2p/r3)
2. p=qs
3. F=qE

4. =pEsin

Part A
Substituting equation 1and 2 into equation 3
F = qE
= (q2)(1/4)(2q2s/r3)

Part B
= pEsin
= (q2s)(1/4)(2q2s/r3)sin90º
= (q2s)(1/4)(2q2s/r3)

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