Assertion : The magnetic field produced by a current carrying solenoid is independent of its length and cross-sectional area.
Reason : The magnetic field inside the solenoid is uniform.
AIIMS 2008, Medium
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Magnetic field inside the solen oid at point $P$ is given by,
$\mathrm{B}=\frac{\mu_{0}}{4 \pi}(2 \pi \mathrm{ni})[\sin \alpha+\sin \beta]$
where $\mathrm{n}=\mathrm{no.}$ of turns per unit length
$=\mathrm{N} / \mathrm{l}$
Thus it is clear that mangetic field is independent of length and cross sectional area.
Also the magnetic field with in the solenoid is uniform and parallel to the axis of the solenoid.
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