Question 1:

An electron is accelerated from rest by a uniform field of magnitude 450000 N/C. a) How long does it take to reach 0.07 c. where c = 3 x 10" m/s is the speed of light? Ons b) How far does it travel in this time? m c) What is its final kinetic energy?A point charge of 4 uC is placed at the origin. There is an external uniform field E = 650i N/C. What is the net force on a 6 /C charge placed at (4 m, 4m)? iNB d A d Three point charges are placed at the corners of a equilateral triangle as shown in the figure above. A = -2 AC, B = -4 /C, 0 = 7/C and d = 4 cm. a) Find the field stregth due to charges B and C at the origin: itDiN/C b) What is the force on charge A? IN c) If the sign of the charge at the origin is changed, what will be the field strength? it IN/C