A long solenoid of radius $1\,mm$ has $100 $turns per $mm$. If $1\,A$ current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:
NEET 2022, Easy
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$B =\mu_{0} ni =\mu_{0} \frac{ N }{\ell} i$
$\therefore B =4 \pi \times 10^{-7} \times \frac{100}{10^{-3}} \times 1=12.56 \times 10^{-2} T$
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