A long solenoid is producing magnetic field on its axis is $B$. If it is cuts into four equal parts and for same current, half number of turns wound on any on piece than value of magnetic field on it axis becomes
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$\mathrm{B}=\mu_{0} \mathrm{nI}$
$\mathrm{B}^{\prime}=\mu_{0} \mathrm{n}^{\prime} \mathrm{I}=\mu_{0}\left(\frac{\mathrm{N} / 2}{\ell / 4}\right) \mathrm{I}=2 \mathrm{B}$
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