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A circular loop of radius $0.0157\,m$ carries a current of $2.0\, amp$. The magnetic field at the centre of the loop is$({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/amp - m)$
  • A${\rm{1}}{\rm{.57}} \times {\rm{10}}{{\rm{ }}^{{\rm{ - 5}}}}\,weber/{m^2}$
  • B$8.0 \times {\rm{10}}{{\rm{ }}^{{\rm{ - 5}}}}\,weber/{m^2}$
  • C$2.5 \times {\rm{10}}{{\rm{ }}^{{\rm{ - 5}}}}\,weber/{m^2}$
  • D${\rm{3}}.14 \times {\rm{10}}{{\rm{ }}^{{\rm{ - 5}}}}\,weber/{m^2}$
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