Dielectric Constant Or Relative Electical Permittivity

When the charges are isolated in medium other then vacuum, for is give by

 Where, ε is called absolute electrical Permittivity of medium. The ratio which is given below is called relative electrical Permittivity of medium.

 The value of K depends only on the nature of medium.

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Some of these questions which may be asked in your Board Examination 2012-2013

Q1: When a plastic comb is passed through dry hair, what type of charge is acquire by comb?

Q2: Does motion of a body affect its charge?

Q3: What is the origin of frictional forces?

Answer these questions in comment box and help your friends