A body contains charge of 10 micro coulomb. After conduction, the charge on the body becomes -2.8 micro coulomb. The number of electrons gained by this charged body

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

The total amount of energy contained in an object

Which describes increasing the efficiency of energy resource