1.

Space between two concentric conducting spheres of radii a and b (b >a) is filled with a medium of resistivity rho. The resistance between the two spheres will be(A) rho/2π(1/a + 1/b)(B) rho/2π(1/a - 1/b)(C) rho/4π(1/a + 1/b)(D) rho/4π(1/a - 1/b)

Answer»

ANSWER:

dR=ρ.4πx2dx

∫dR=ρ.∫ab4πx2dx

R=4πρ[−x1]ab

R=4πρ(a1−b1)



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