A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. When a current $i$ passes through the coil, the magnetic field at the centre is
A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. When a current $i$ passes through the coil, the magnetic field at the centre is
- A
$\frac{{{\mu _0}Ni}}{b}$
- B
$\frac{{2{\mu _0}Ni}}{a}$
- C
$\frac{{{\mu _0}Ni}}{{2\left( {b - a} \right)}}ln\frac{b}{a}$
- D
$\frac{{{\mu _0}Ni}}{{\left( {b - a} \right)}}ln\frac{b}{a}$
Similar Questions
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- [AIIMS 2019]
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