Find out magnetic field at axial point \( \mathrm{P} \) of solenoid...

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Find out magnetic field at axial point \( \mathrm{P} \) of solenoid shown in figure (where turn density \( n \) and current through it is I)
img src=https://penpencil-static-content.s3.ap-south-1.amazonaws.com/5eb393ee95fab7468a79d189/rqg58ifr1rwfy89r8apzi8acs.png /
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