What would happen to the magnetic field lines if the current flowing through the conductor is reversed.

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Solution

We reverse the direction of the electric current, then the direction of the magnetic field will be reversed.
If the direction of the current is reversed, the compass needle will move in the opposite direction because the polarity of the magnetic field has reversed.

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What would happen to the magnetic field lines if the current flowing through the conductor is reversed.

We reverse the direction of the electric current, then the direction of the magnetic field will be reversed. If the direction of the current is reversed, the compass needle will move in the opposite direction because the polarity of the magnetic field has reversed.

We reverse the direction of the electric current, then the direction of the magnetic field will be reversed.
If the direction of the current is reversed, the compass needle will move in the opposite direction because the polarity of the magnetic field has reversed.