A solid conducting sphere of radius ra is placed concentrically inside a conducting spherical shell of inner radius rb1 and outer radius rb2. The inner sphere carries a charge Q while the outer sphere does not carry any net charge. The electric field for rb1 < r < rb2 is
A) -kQ/r2.
B) kQ/r2.
C) -2kQ/r.
D) 2kQ/r.
E) zero.
Correct Answer:
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