Which of the following statement is incorrect about the magnetic field produced due to a current-carrying coil?

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Deflection in the magnetic needle kept near the coil increases with an increase in current.

Deflection in the magnetic needle kept near the coil decrease with an increase in distance from the coil.

Deflection in the magnetic needle kept near the coil increases with an increase in the number of turns in the coil.

Deflection in the magnetic needle does not reverse with reversing the direction of the current.

answer is D.

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Detailed Solution

The wrong statement is " Deflection in the needle does not reverse with reversing the direction of the current.

We know that when current is passed through a conductor, a magnetic field is produced around it. The magnetic field produced due to a current-carrying coil depends on the current through the coil, the number of turns in the coil and the distance of the point where the magnetic field is being measured.

The deflection in the magnetic needle reverses due to the reverse in direction of the current. i.e. change in direction of current changes the direction of the magnetic field.

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