question_answer 18)

A point charge is a distance 5 cm directly above the centre of a square of side 10 cm, as shown in the given figure. What is the magnitude of the electric flux through the square?                 Hint: Think of the square as one fact of a cube with edge 10 cm.  

Answer:

The charge can be assumed to be placed as shown in the figure.                 Using the flux through one square surface                                 .