When a positively charged sphere is brought near a metallic sphere, it is observed that a force of attraction exists between the two. It means that

Options

A. the metallic sphere may be electrically neutral
B. the metallic sphere is necessarily negatively charged
C. nothing can be said about the charge of the metallic sphere.
D. the metallic sphere may be negatively charged

Answer

A, D

Explanation

a.,d.
Suppose a positively charged sphere is brought near an unchanged metallic sphere, then on nearer surface of the uncharged sphere, negative charge is induced and on farther will obsrved between these two shperes. Therefore, if a force of attraction is observed between a positively charged sphere and a metallic sphere, it cannot be conclued that the metallic sphere is necessarily negatively charged. Therefore, option (b) is wrong and option (a) and (d) are correct.