i have been at this time since 2 this afternoon, and ive only got 3 of 8 problems completely done. i need to get these done before i go insane. heres the first: plane x+2y=5 carries charge Ps = 6nC/m^2. determine E at (-1,0,1) okay, this is obviously a surface charge problem. and E = integral of Ps*ds. i just solve for E than plug in the (-1,0,1) right? what i cant figure out are the limits of integration. would this limit work for y? y = (5-x)/2. that would be the upper limit and the lower limit would be 0. what would work for x?