The electric potential at the center of the half-ring is [tex]\frac{kQ}{R}[/tex].
Electric force experienced by the charge
The force experienced by the charge is calculated by Coulomb's law;
[tex]F = \frac{kQ^2}{R^2}[/tex]
Electric field strength
The electric field strength is force per unit charge;
[tex]E = \frac{F}{Q} = \frac{kQ}{R^2}[/tex]
What is electric potential?
The electric potential is work done in moving a charge from infinity to a certain point.
V = Ed
[tex]V = \frac{kQ}{R^2} \times R\\\\V = \frac{kQ}{R}[/tex]
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