Please answer this question with an explanation experts..
Kindly ignore the markings on the question and answer

Dear Student,
Assertion: 
The magnetic field due to solenoid carrying current I and having n number of turns per unit length

 B = μo/4π (2πnI) (sin α + sin β)

It is obvious that magnetic field is independent of length and area.
Reason: 
Also, magnetic field is uniform inside the solenoid.

So both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion (option b).

Regards

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