Question

Identical point charges q1 and q2 each have a positive charge +6.00 μC. Charge q1 is held fixed on the x-axis at x=+0.400 m, and q2 is held fixed on the x-axis at x=−0.400 m. A small sphere has charge Q=−0.200 μC and mass 12.0 g. The sphere is initially very far from the origin. It is released from rest and moves along the y-axis toward the origin. (a) As the sphere moves from very large y to y=0, how much work is done on it by the resultant force exerted by q1 and q2? (b) If the only force acting on the sphere is the force exerted by the point charges, what is its speed when it reaches the origin?

Answer 1

-0.2UC +64c '+6.00 uc. V=Potential when its at y=0 W: qV - ax Rxox0.2 X1012 0.4 - 2 x 9x 10 x 6 x 0-2x10 0.4 w = -0,054 J now, Im 122= 0.054 V = 2 x 0.050 12X 203 v = 3 m/8