A charged dust particle of mass m = 2.32 times 10-5 kg is launched (using the mo

Question

A charged dust particle of mass m = 2.32 times 10-5 kg is launched (using the most carefully crafted dust launcher available) horizontally along the axis of a negatively charged ring. The ring has radius R = 2.21 mm, and is firmly mounted in a space ship that is far, far away from any planets. The dart is released at the center of the ring with a velocity of 1.47 m/s. The charge on the dust particle is 6.52 times 10-7C and the charge on the ring is -2.75 times 10-6C is enough to bring the dust particle momentarily to rest. How far out along the axis with the dust pat tide travel before coming to rest?

Explanation / Answer

as f=q1q2/r^2 and f=mg

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