Fields of an electron At a particular instant a proton is at the origin, moving with velocity < 6×104, −3×104, −5×104 > m/s. At this instant: (a) What is the electric field at location < 4×10−3, 2×10−3, 3×10−3 > m, due to the proton? E→ = < > N/C (b) What is the magnetic field at the same location due to the proton? B→ = < > T