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A solid sphere of radius 50.0 cm has a total positive charge of 25.0 μC uniformly...

A solid sphere of radius 50.0 cm has a total positive charge of 25.0 μC uniformly distributed throughout its volume.
(a) Calculate the magnitude of the electric field at a point 10.0 cm from the center of the sphere.
(b) Calculate the magnitude of the electric field at a point 75.0 cm from the center of the sphere.
c) A proton enters a region containing a uniform electric field
of magnitude 1.00 x 10^4 N/C. The separation between the
plates is 1.00 m. If the entrance speed is 3.0 x 10^5 m/s, what
is the exit speed of the proton? Hint: Neglect the effect of
gravity.

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