A charged non-conducting rod, with a length of 2.00 m and a cross-section al area of 4.00 cm2, lies along the positive side of an x axis with one end at the origin. The volume charge density p is charge per unit volume in coulombs per cubic meter. How many excess electrons are on the rod if p is?
(a) Uniform, with a value of – 4.00μC/m3, and
(b) Non-uniform, with a value given by p = bx2, where b = – 2.00μC/m5?