A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B$. It is then bent into a circular loop of $n$ $turns$. The magnetic field at the centre of the coil will be
A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B$. It is then bent into a circular loop of $n$ $turns$. The magnetic field at the centre of the coil will be
- [AIEEE 2004]
- [NEET 2016]
- A
$nB$
- B
$n^2B$
- C
$2nB$
- D
$2n^2B$
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- [JEE MAIN 2023]