question_answer

On connecting a battery to the two corners of a diagonal of a square conductor frame of side \[a\] the magnitude of the magnetic field at the centre will be             [MP PET 2002]

A)            Zero                                         

B)            \[\frac{{{\mu }_{o}}}{\pi a}\]

C)            \[\frac{2{{\mu }_{o}}}{\pi a}\]                                          

D)            \[\frac{4{{\mu }_{o}}i}{\pi a}\]