Question

Figure (30-Q7) shows a closed surface that intersects a conducting sphere. If a positive charge is placed at point P, the flux of the electric field through the closed surface
(a) will remain zero
(b) will become positive
(c) will become negative
(d) will become undefined
Figure

Answer 1

Through the closed surface, the electric field’s flux will become positive.

Explanation:

• The negative and positive charges are created on the various parts of the sphere because of induction. Thus, via the closed surface, the flux is positive.
• At point P, a positive charge will induce a negative charge. This takes place at the conducting sphere’s near face, whereas on the sphere’s farther end, the positive energy is created.
• Since, by the closed surface, this farther end is intersected or enclosed, the flux becomes positive because of the positive charge that is induced.