Please i really need help!

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Which two particles are found in the center of an atom