The electric field at the surface of a charged, solid, copper sphere with radius 0.200 m is 3800 N>C, directed toward the center of the sphere. What is the potential at the center of the sphere, if we take the potential to be zero infinitely far from the sphere

The potential at the center of the sphere = -760 V

Explanation:

Since the electric field is directed towards the center of the sphere, the charge is negative and hence the potential is negative.

Therefore, the potential at the center of the sphere, V = -Er

E = 3800 N/C

r = 0.200 m

V = -3800 * 0.2

V = -760 V

760 V.

Explanation:

Given:

Radius, r = 0.2 m

Electric field, E = 3800 N/C

E = V/d

Where,

V = potential difference

d = distance from the field

V = 3800 × 0.2

= 760 V.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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