What can cause a change in the direction of a magnetic field?

Change in the direction of current in a wire will change the magnetic field caused by that wire

Explanation:

As we know by Biot Savart law that magnetic field due to a current carrying element is given by

so here if the direction of current in the wire reversed then it will change the direction of length vector

This will reverse the direction of magnetic field at a given space

So magnetic field produced by a current carrying element only depends on the direction of the current so on reversing the direction of current we can change the magnetic field direction

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explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

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