write and explain (2 sentences) the continuity equation. which fundamental law is the basis of the continuity equation. (1) ii) point pl in space possesses 1020 electrons at time t-0 s. some of the electrons start to fly to the point p2 in 10 m distance with a speed of v-0.1c. 1018 electrons leave p1 each second. plot q, i, p, as a function of time at p1, p2, and exactly in between, i. e. p3. plot j at p3. do not forget units. write out all of the integrals. (3) iii) derive the current density of a proton flying in a circle with 1 cm radius in the x-y plane. velocity 10 m/s, position at t-0 on the x-axis. (1) iv) what are the integral and differential relations between current and current density? (1) v) the statement "i-2 a" is incomplete. which two pieces of information are missing? (1) vi) explain the difference between pat and ρ. (1)