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What is the electric potential at a point dista... - WAEC Physics 1992 Question

What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?
A
q2/4πεor2
B
q/4πεor2
C
q2/4πεor
D
qr/4πεo
correct option: b
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