C. coil suspended by bearings.
<span>but im not 100% sure</span>
Explanation:
(1). Formula to calculate the potential difference is as follows.
= 
= 
= 
= 
= 38.7 volts
Therefore, magnitude of the potential difference between the two spheres is 38.7 volts.
(2). Now, formula to calculate the energy stored in the capacitor is as follows.
E = 
= 
= 
Thus, the electric-field energy stored in the capacitor is
.
Answer:
Explanation:
Use the following equation:
and solve for F:
and filling in:

F = 4.0 ×
N