1.

Two long coaxial cylindrical metal tubes (inner radius a, outer radius b) stand vertically in a tank of dielectric oil (of mass density rho , dielectric constant K). The inner one is maintained at potential V and the outer one is grounded. To what equilibrium height (h) does the oil rise in the space between the tubes? [Assume this height ( h) as an equilibrium height]

Answer»

`(epsilon_(0)2V^(2)(K-1))/(grho(b^(2)-a^(2))1n((b)/(a)))`
`(epsilon_(0)2V^(2)(K-1))/(RHO(b^(2)-a^(2))g1n((b)/(a)))`
`(4epsilon_(0)2V^(2)(K-1))/(grho(b^(2)-a^(2))1n((b)/(a)))`
`(6epsilon_(0)2V^(2)(K-1))/(rho(b^(2)-a^(2))g1n((b)/(a)))`

ANSWER :B


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