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A spherical metallic electrode has a rad...

A spherical metallic electrode has a radius 8 cm. It is concentric with a spherical metal shell of radius 10 cm. The inner space is filled with an insulator of resistivity `10^-4Omega-m`. So, the resistance of the insulator is

A

a)`1.99xx10^(-5)Omega`

B

b)`0.99xx10^(-5)Omega`

C

c)`2.99xx10^(-5)Omega`

D

d)`3.99xx10^(-5)Omega`

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