?

Electricity and Magnetism

Free Version

Upgrade subject to access all content

Easy

Speed of a Charge at Different Equipotential Surfaces

EANDM-N3K6$X

The figure below shows a series of equipotential surfaces between a grounded metal plate (in blue) and a charged ellipsoid (in red).

Created for Albert.io. Copyright 2016. All rights reserved.

A mass $m = 2 \: \rm ng$ and charge $ q = -3 \times 10^{-5} \rm C$ at point A is traveling at a speed $v_A = 480 \:\rm m/s$.

How fast is the mass moving when it reaches the Point B?

A

0 m/s

B

1132 m/s

C

75 m/s

D

375 m/s

E

566 m/s