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

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the metallic sphere may be electrically neutral

the metallic sphere is necessarily negatively charged

nothing can be said about the charge of the metallic sphere

the metallic sphere may be negatively charged

answer is A.

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Detailed Solution

Suppose a positively charged sphere is brought near an uncharged metallic sphere, then on nearer surface of the uncharged sphere, negative charge is induced and on farther surface, positive charge is induced. Hence, a force of attraction will be observed between these two spheres. Therefore, if a force of attraction is observed between a positively charged sphere and a metallic sphere, it cannot be concluded that the metallic sphere is necessarily negatively charged. Therefore, option (2) is wrong and options (1) and (4) are correct.

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