An equipotential surface that surrounds a point charge q has a potential of 516 V and an area of 1.01 m2. Determine q

Answer 1

A=4πr²
=> r=A/4π
φ=kq/r

k =9•10⁹ N•m²/C²
φ=516 V,
A= 1.01 m^2

q= φr/k=φA/4πk=..