Which of the following statements is incorrect for a current-carrying solenoid?
- AThe magnetic field at all points inside the solenoid is uniform.
- BIt acts as a magnet when a soft iron core is placed inside it to produce a strong magnetic field.
- CThe pattern of its magnetic field lines is different from that of a bar magnet.
- DReversing the direction of the current in the solenoid reverses the positions of its $N$ and $S$ poles.
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