Explain and answer please 1. Three point charges q1= 1mc, q2=2mc and q3=-3mc are respectively located at (0,0,4),(-2,6,1) and (3,-4,-8) 1.1 determine q1 1.2 find the electric field intensity at q1 2. Given that the current density j is given by j=10(x^2+y^2)az [A/m^2] 2.1 determine the current density at point (-3,4,6) 2.2 find the current I, crossing an area on the xy plane given by 0<=x<=1 , 0<=y<=3 Hint I=double integral (s) jds; ds=azdxdy 3.consider the conducting plates shown in fig if v(z=0)= 0, and v(z=5mm)=100v, determine 3.1 the electric potential V 3.2 the electric field intensity , E