No measurable effect at all. The electrons which cause the negative charge have such an unbelievably small mass that billions of them cannot make any observable change to the mass.
Mass and charge are not connected. Negative charge is the charge carried by an electron.
Mass of a body is a positive quantity. The gravitational force between two masses is always attractive. Electric charge can be positive or negative or zero.
A electron is a subatomic particle outside the nucleus carrying a negative charge and very little mass. Other mass is negligible mass or a negative charge.
If you compare the mass of a positron to an electron, or of a proton to an anti-proton, and so forth, the mass is the same, even though the charge is reversed. Negative charge does not mean negative mass, it has no bearing on the mass.
Yes, the neutron has a negative charge and a mass that is smaller than the mass of a proton.
When an object receives a negative charge, there is no change in its mass. Mass is a fundamental property of matter that is not affected by the addition or removal of charge. The negative charge simply alters the distribution of electrons on the object's surface.
A black hole can have either positive, negative, or neutral charge. The charge of a black hole can be acquired through the consumption of charged particles, but the overall effect of the charge on the black hole's properties is not significant compared to its mass.
An electron has a negative charge and a mass close to 0 amu (atomic mass unit).
You're probably thinking of electrons, whose mass is much smaller than nucleons but also have a negative charge. Indeed, the electron has the smallest amount of mass of any particle with a negative charge.
its mass will increase by an amount too small to measure directly
When a body becomes negatively charged, its mass does not change. The charge on the body simply affects its electric field and interactions with other charged objects, but it does not alter its fundamental mass. It is the number of protons and neutrons in an object that determines its mass, not its charge.
No, antimatter does not possess negative mass. Antimatter has the same mass as regular matter, but opposite charge.