Q. A spherical metal shell of radius and a solid metal sphere of radius are kept far apart and each is given charge . Now they are connected by a thin metal wire. Then

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Solution:

Inside a conducting shell electric field is always zero.
Therefore, option (a) is correct. When the two are connected,their potentials become the same.
or
Since,
Option (b) is correct.
Potential is also equal to,
or or
Option (c) is correct.
Electric field on surface, or
Since, or
Option (d) is also correct.
Correct options are (a), (b), (c) and (d).