i. Assuming the HCl molecule consists of point-like ions (H* and Cl¯) separated by1.0 x 10-10 m, find the dipole moment of the molecule. ii. Calculate the magnitude and direction

of the torque exerted on this dipole if the molecule is subjected to an external electric field of 4.0× 106 N C-', when the angle between the field direction and the axis of the molecule is 45°. (b) Three charges (Q, q, and q) are placed at three corners of a square (side length a) as shown. i. Find the magnitude and direction of the electric field at the vacant corner P. \text { ii. Show that the field at } P \text { is zero if } Q=-2 \sqrt{2} q \text {. }