please answer the questions below

A beam contains 6.6 X 105 doubly charged positive ions per cubic centimeter, all ofwhich are moving north with a speed of 3.2 X 105 m/s. _) What is {a} the magnitude of the current density and [bi direction of the current density J' .lc] What additional quantity do you need to calculate the total current i in this ion beam? [3) Number n Units V lbl V. [Cl V Asteady beam of alpha particles to = + 26, mass m = 6.68 X 10'27 kg} traveling with constant kinetic energy 21 MeV carries a current of 0.19 uA. (a) lfthe beam is directed perpendicular to a atsurface, how many alpha particles strike the surface in 3.8 s? [bi At any instant, how many alpha particles are there in a given 26 cm length of the beam? [c] Through what potential difference in volts is it necessary to accelerate each alpha particlefrom rest to bring it to an energy of 21 MeV? {a} Number n Units V {b} Number n Units v_ [cl Number n Units V