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A conductor having a cavity is given a positive charge. What are field strengths $E_A,E_B$ and $E_C$ at point A (inside the cavity), B (with in conductor but outside cavity ) and C (outside the conductor ) respectively ?

$(A)\;E_A \neq 0, E_B \neq 0 , E_C \neq 0 \\ (B)\;E_A \neq 0, E_B = 0 , E_C \neq 0 \\ (C)\; E_A = 0, E_B = 0 , E_C \neq 0 \\ (D)\;None $

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$ E_A = 0, E_B = 0 , E_C \neq 0$
Hence C is the correct answer.
answered Jan 8, 2014 by meena.p
 

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