question_answer

When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is \[{{B}_{1}}\] If the same wire is turned into three loops to make a circular coil, the magnetic induction at the center of this coil for the same current will be  [MP PMT 2002]

A)            \[{{B}_{1}}\]                         

B)            \[9\,{{B}_{1}}\]

C)            \[3\,{{B}_{1}}\]                   

D)            \[27\,{{B}_{1}}\]