A charge Q = -610 nC is uniformly distributed on a ring of 2.4 m radius. A charg

Question

A charge Q = -610 nC is uniformly distributed on a ring of 2.4 m radius. A charge q = +480 nC is placed at the center of the ring. Points A and B are located on the axis of the ring, as shown. In Fig. 23.2c, an electron is projected along the axis of the ring from infinity. The electron reaches and comes to a momentary halt at a point on the axis that is 5.0 m from the center of the ring. The initial speed of the electron at infinity is closest to:

1.1 x 106 m/s
6.7 x 106 m/s
4.5 x 106 m/s
2.2 x 106 m/s
3.4 x 106 m/s

Explanation / Answer

1/2 mv^2=ke*q1q2/r12+ke*Q*qe/sqrt(x^2+a^2) plug in number, solve for v

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