# What does it signify that electrostatic mass cannot exist without inertial mass?

From Coulomb's law and Newton's second law we can state that if there is electrostatic mass (charge) at any point of space then there has to exist inertial mass also at that point of space. Otherwise, in the influence of any other electric field the electrostatic mass will accelerate at infinite acceleration, which is un-physical. So electrostatic mass(charge) has to exist with inertial mass. What does this signify? Can that be the basis of the assumption that electromagnetism and gravitation can be unified?

• One thing to think about is that if you have charge somewhere, it has some energy associated with it, and since energy and mass are equivalent, this means it by its very nature has some inertial mass. I don't think this really says anything about unifying E&M and gravity. – JotThisDown Jan 11 '15 at 19:28
• Energy is associated with every charge and energy is equivalent to mass but we don't know what is just 'energy' we know it in its different forms only...the energy associated with charge is in the electrostatic field associated with it with a particular energy density at each point...so i think that it is conceptually wrong to say that charge has some energy and since energy is equivalent to mass charge has to have mass... – Dvij Mankad Jan 11 '15 at 20:00
• Excuse me, I don't understand why "From Coulomb's law and Newton's second law we can state that if there is electrostatic mass (charge) at any point of space then there has to exist inertial mass also at that point of space." is true. – gented Sep 23 '15 at 23:37
• If it has some charge then it will experience some non-zero force in an electric field. If it has doesn't have non-zero inertial mass then it means that its acceleration becomes infinity according to F=ma. But it must not be the case. So the particle has to have some non-zero inertial mass if it has some non-zero electric charge(electrostatic mass). – Dvij Mankad Sep 24 '15 at 9:55