The electric potential at 0.9m from a point charge is `+50 V`. What is the magnitude and sign of the charge ?

The electric potential at 0.1m from a point charge is 50V. What is the magnitude of the charge?

The electric potential at 45cm from a point charge is +100V. what is the magnitude and sign of charge ?

The electric potential at 0.1m from a point charge is 90V. What is the magnitude of the charge? Given, epsilon_0=8.854xx10^-12 C^2 N^-1 m^-2

The electric potential at 0.3m from a point charge is 30V. What is the magnitude of the charge? Given epsilon_0=8.854xx10^-12 C^2 N^-1 m^-2