Please solve question number 9 for me. The Question is: A uniform Ring of charge

Question

Please solve question number 9 for me.

The Question is: A uniform Ring of charge with radius 0.3m is on the y-z plane centered on the x axis as shown. At point P(x = 0.4 m on the x-axis) the potential difference relative to infinity is 450V.

Question 8 is What is the total charge on the ring? answer: 2.5 * 10^-8C

Question 9 is: A point partical with charge 1.5 * 10^-6 C and mass 6*10^-3 kg is released from rest at point P. What velocity(including direction) does it have when it is a long way away from the ring? The answer is 0.47 m/s i

I am confused about question 9.

Use the diagram to the right for the following two questions. A uniform ring of charge with radius 0.30 m is on the y - z plane centered on the x axis as shown. At point P (x = 0.40 m on the x-axis) the potential difference relative to infinity is 450 V. What is the total charge on the ring 1.5 x 10^-8 C 2.0 x 10^-8 C 2.5 x 10^-8 C 3.5 x 10^-8 C 5.0 x 10^-8 C A point particle with charge 1.5 x 10^-6 C and mass 6.0 * 10^-3 kg is released from rest at point P. What velocity (including direction) does it have when it is a long way away from the ring (0.47 m/s)cup i (0.47 m/s)cup j -(270 m/s)cup i (390 m/s)cup i (390 m/s)cup j

Explanation / Answer

9.

qV =0.5*m*v2

speed =v=(2qV/m)1/2 =(2*1.5*10-6*450/6*10-3)1/2 =0.47 m/s

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