question_answer

A plane electromagnetic wave in a non-magnetic dielectric medium is given by \[\overset{\to }{\mathop{\operatorname{E}}}\,={{\overset{\to }{\mathop{\operatorname{E}}}\,}_{0}}\]\[(4\times {{10}^{-7}}x-50t)\] with distance being in meter and time in seconds. The dielectric constant of the medium is :   JEE Main  Online Paper (Held On 22 April 2013)

A)  2.4                                        

B)  5.8

C)  8.2                                        

D)  4.8