Three point charges are placed at the following points on the x-axis `: 2 mu C " at " x=0, -3 mu C " at " x=40 cm " and " -5 mu C " at " x=120` cm. Calculate the force on the `-3 mu C` charge.

Two point charges of +1.5 mu C " and " -1.5 mu C are placed at the corners A and B of an -6 mu C placed at the third corner of the triangle ?

Four point charges q_(A) = 2 mu C , q_(B) = -5 mu C, q_(C) = -2 mu C and q_(D) = -5 mu C are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 mu C placed at the center of the square ?

Four point charges q_(A) = 2 mu C , q_(B) = -5 mu C, q_(C) = 2 mu C and q_(D) = -5 mu C are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 mu C placed at the center of the square ?

Four point charges q_A = 2 mu C , q_B = -5 mu C , q_C = 2 mu C and q_D = -5 mu C are located at the corners of a square ABCD of side 10 cm. What is the forcef on a charge of 1 mu C placed at the centre of the square?

Two point charges of, 1 mu C and -1 mu C are kept at (-2 m, 0) and (2 m, 0) respectively. Calculate the electric field at point (0, 5 m).

Two point charges 6 mu C and 2 mu C are separated by 3 cm in free space. Calculate the work done in separating them to infinity.

Two point charges A and B of value of +15 mu C and +9 mu C are kept 18 cm apart in air. Calculate the work done when charge B is moved by 3cm towards A.

Four point charges q_(A) =2 mu C ,q_(B )=-5 muC,q_(c )=2 mu c and q_(d)=-5 mu c are force on a charge of 1 mu c placed at the centre of the square