Predict and explain. An electrically neutral sphere is given a negative charge.
(1) In principle, does the object's mass increase, decrease or remain the same after being charged?

Two identical metallic spheres of exactly equal asses are taken. One is given a positive charge Q coulomb and the other an equal negative • charge. Their masses after charging are different.

(ii) Choose the best appropriate explanation from the following (a) To give the sphere a negative charge, we must give it more electrons and this will increase its mass. (b) A positive charge increases the sphere's mass and a negative charge decreases its mass, (c) Charge is conserved, therefore the mass of the object will remain the same.

Predict and explain Gaussian surface A has twice the area of Gaussian surface B. Both surfaces enclose the same charge Q. Is the electric flux through surface A greater than, less than or the same as the electric flux through surface B ?

Predict and explain Gaussian surface A has twice the area of Gaussian surface B. Both surfaces enclose the same charge Q. Choose the best explanation from the following. (a) Gaussian surface B is closer to the charge, since it has the smaller area. It follows that it has the greater electric flux. (b) The two surfaces enclose the same charge and hence they have the same electric flux. (c ) Electric flux is proportional to the area Therefore , Gaussian surface A has the greater electric flux.

Two charged particles carrying equal charge enter into a magnetic field region after being accelerated through the same potential difference. The particles describe circular paths of radii R_1 and R_2 respectively. If m_1 and m_2 are the masses of the particles then ((m_1)/m_2) is given by

Is the mass of an amber rod after rubbing with fur . (i).less than, (ii) greater than or (iii) same as its mass before charging? Explain.