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Identify the wrong statement regarding t...

Identify the wrong statement regarding the magnetic field produced by a solenoid with, N, as the number of turns per unit length and a DC current, I . flowing through Its wire.

A

The field is almost uniform inside except in the outer regions near the edge

B

The field gets enhanced linearly with the increase in either Nor I

C

An introduction of an iron core enhances the magnetic field

D

The magnetic field lines diverge far away from the solenoid

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