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Space between two concentric conducting spheres of radii a and b (b > a) is filled with a medium of resistivity ρ. The resistance between the two spheres will be :

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + π ρ b 1 a 1 2
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + π ρ b 1 a 1 4
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − π ρ b 1 a 1 2
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − π ρ b 1 a 1 4

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − π ρ b 1 a 1 4

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