23. Calculate the electric field intensity in which a proton is accelerated by 3.4 x 10 m/s towards East. What would be the direction of electric field? Hint: F qE and F = ma = Ans. 35.5 N/C, towards East 24. Calculate the torque produced on a dipole with moment 5x 10 C-m, held at 150 with the electric field 720 N/C. How much work would be done to rotate the dipole by 180 from its position? Ans. 0.18 N-m; 4.8 x 102 Joule 25. A charge 5 C uniformly distributed over a thin ring of radius 0.05 m. Find the electric field intensity at a point, 12 cm away from its centre at the axis of ring.