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Which one of the following is not a property of magnetic field lines due to current in a circular wire?

A) The magnetic field lines are nearly circular near the wire.

B) Near the centre of the loop, the magnetic field lines are nearly parallel and straight.

C) If the number of turns in the coil increases, the strength of the magnetic field produced will increase.

D)  Strength of the magnetic field will decrease if radius of the circular coil is decreased.

E)  None of these