Question

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

Answer 1

The changing magnetic field caused by the material's motion induces a current in the coil of wire proportional to the change in field. If a 0 is represented, the magnetic field does not change between the two domains of a bit, so no current is induced as the magnetic material passes the coil.

Answer 2

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

Step-by-step explanation:

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

`dB = \frac{\mu_o i (\vec {dL} * \hat r)}{4\pi r^2}`

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