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Electrostatic Potential And Capacitance

Question
CBSEENPH12040011
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Two parallel metal plates having charges +Q and -Q faces each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will

  • become zero

  • increase

  • decrease

  • remain same

Solution

B.

increase

The electric field in a vacuum
straight E equals space fraction numerator straight sigma over denominator 2 straight epsilon subscript straight o end fraction
When the plates are dipped in kerosene oil tank, then the electric field between the plate will
straight E subscript straight o space equals space fraction numerator straight sigma over denominator 2 straight epsilon subscript straight o straight k end fraction space because space straight k space greater than 1 therefore space straight E space less than thin space straight E subscript straight o
so, the electric field between the plates will decrease.

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