Help me solve these physics questions

Physical Constants Electronic charge, e = 1.6 x 10-19C, Mass of electron, me = 9.1 x 10-31Kg Permittivity of vacuum,co - 8.85 x 10-12 Fm- Permeability of vacuum, /40 - 4x x 10-7 Hm-1 Q1. a) Define the following terms 1) Ohm (1 Mark) il) Current density (1 Mark) ifi) Coulomb (1 Mark) (b i) State the Coulombs law (1 Mark) in) Differentiate between potential difference and electromotive force (3 Marks) ill) Calculate the number of electrons passing through a wire per second if the current flowing is 2mA (3 Marks) (c) An electron of mass 9.1 x 10 31 Kg and charge -1.6 x 10-19C is moving at a velocity 1.6 x 10'm/s perpendicular to a magnetic field of 1.4 x 10 7. Calculate the radius of the path (4 Marks) (d) A parallel plate capacitor of area 0.03m has a 2mm gap between its two plates. The gap is filled with air. If a sheet of insulating material 1.5mm thick and of relative permittivity 6 is placed between the plates, calculate its capacitance. (6 Marks) 1) State the Kirchoff's law for a circuit network (2 Marks) in) Two protons are 6,0 fin apart in the nucleus of a U atom, Calculate the potential energy associated will the electric force that acts between these two particles in ev (4 Marks)