A long solenoid has a radius a and number of turns per unit length is – McqOptions

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1.	A long solenoid has a radius a and number of turns per unit length is n. If it carries a current i, then the magnetic field on its axis is directly proportional to [MP PMT 1994]
A.	ani
B.	ni
C.	\[\frac{ni}{a}\]
D.	\[{{n}^{2}}i\]
Answer» C. \[\frac{ni}{a}\]

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