What is the magnetic field at a distance $R$ from a coil of radius $r$ carrying current $I$ ?
What is the magnetic field at a distance $R$ from a coil of radius $r$ carrying current $I$ ?
- [AIIMS 2007]
- A
$\frac{{{\mu _0}I{R^2}}}{{2\,{{({R^2} + {r^2})}^{\frac{3}{2}}}}}$
- B
$\frac{{{\mu _0}I{r^2}}}{{2\,{{({R^2} + {r^2})}^{\frac{3}{2}}}}}$
- C
$\frac{{{\mu _0}I}}{{2r}}$
- D
$\frac{{{\mu _0}I}}{{2R}}$
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- [AIIMS 2018]