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The flux density obtained at the centre of a circular coil of radius $R$ which carries a current $i$, is $B_0$. At a distance $‘pR’$ from the centre on the axis, the flux density will be
  • A$\frac{{{B_0}}}{{\left( { - p + 1} \right)\sqrt {p + 1} }}$
  • B$\frac{{{B_0}}}{{\left( {{p^2} + 1} \right)\sqrt {{p^2} - 1} }}$
  • C$\frac{{{B_0}}}{{\left( {{p^2} + 1} \right)\sqrt {{p^2} + 1} }}$
  • D$\frac{{{B_0}}}{{\left( { p - 1} \right)\sqrt {p - 1} }}$
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