1.Staying inside the solenoid, the magnetic field generally decreases in magnitu

Question

1.Staying inside the solenoid, the magnetic field generally decreases in magnitude as you move away from the exact center of the solenoid along a direction perpendicular to the axis of the solenoid (moving along the x-axis would be such a direction, for instance).
2.Reversing the direction of the current without changing its magnitude results in the magnetic field reversing at every point, but no change in the magnitude of the field at any point.
3.The magnetic field generally decreases in magnitude as you move away from the exact center of the solenoid along the solenoid's axis (the y-axis, in this case).
4.As long as the current is non-zero, changing the magnitude of the current without changing its sign results in a change in the magnitude of the magnetic field at every point, but no change in the direction of the field at any point. (Exceptions to this are points where the field is zero, which remain at zero.)
5.Increasing the size of the loops making up the solenoid increases the magnitude of the magnetic field at the center of the solenoid.
6.Increasing the separation between the coils of the solenoid increases the magnitude of the magnetic field at the center of the solenoid.

Explanation / Answer

The fallowing statements are correct : (b)
(4)-As long as the current is non-zero, changing the magnitude of the current without changing its sign results in a change in the magnitude of the magnetic field at every point, but no change in the direction of the field at any point. (Exceptions to this are points where the field is zero, which remain at zero.)

(2)-Reversing the direction of the current without changing its magnitude results in the magnetic field reversing at every point, but no change in the magnitude of the field at any point.

(3)-The magnetic field generally decreases in magnitude as you move away from the exact center of the solenoid along the solenoid's axis (the y-axis, in this case).

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