• # question_answer 7) A current I flowing through the loop as shown in figure. The magnetic field at centre O is- A) $\frac{7{{\mu }_{0}}I}{16R}\otimes$              B) $\frac{7{{\mu }_{0}}I}{16R}\odot$C) $\frac{5{{\mu }_{0}}I}{16R}\otimes$              D) $\frac{5{{\mu }_{0}}I}{16R}\odot$

$\frac{3}{8}\,\,\frac{{{\mu }_{0}}I}{R}\,\,+\,\,\frac{{{\mu }_{0}}I}{8(2R)}=\frac{7{{\mu }_{0}}I}{16R}\otimes$