question_answer

In the loops shown in figure, all curved sections are either semi-circles or quarter circles. All the loops carry same current. The magnetic fields at the centres have magnitudes\[{{B}_{1}}\], \[{{B}_{2}}\], \[{{B}_{3}}\], and\[{{B}_{4}}\] Then, which is correct?                           

A) \[{{B}_{1}}>{{B}_{2}}>{{B}_{3}}>{{B}_{4}}\]

B) \[{{B}_{3}}>{{B}_{4}}>{{B}_{1}}>{{B}_{1}}\]

C) \[{{B}_{4}}>{{B}_{1}}>{{B}_{2}}>{{B}_{3}}\]

D) \[{{B}_{1}}>{{B}_{4}}>{{B}_{3}}>{{B}_{2}}\]