question_answer

A conductor having a cavity is given a positive charge. Then field strengths\[{{E}_{A}},{{E}_{B}}\]and\[{{E}_{C}}\]at point A (within cavity), at B (within conductor but outside cavity) and C (near conductor) respectively will be:

A)  \[{{E}_{A}}=0,{{E}_{B}}=0,{{E}_{C}}=0\]

B)  \[{{E}_{A}}=0,{{E}_{B}}=0,{{E}_{C}}\ne 0\]

C)  \[{{E}_{A}}\ne 0,{{E}_{B}}=0,{{E}_{C}}\ne 0\]

D)  \[{{E}_{A}}\ne 0,{{E}_{B}}\ne 0,{{E}_{C}}\ne 0\]

E)  none of the above