a 4 mc charge has velocity u 5 1.4ax 2 3.2ay 2 az m/s at point p(2, 5, 23) in the presence of e 5 2xyzax 1 x2zay 1 x2yaz v/m and b 5 y2ax 1 z2ay 1 x2az wb/m2. find the force on the charge