A current in a wire increases from 2 A to 6 A. How will the magnetic field 0.01 m from the wire change?

It increases to three times its original value.  Given the same radius of wire and other constant property. current is directly proportional to the magnetic field.

B1=B2

MoI1/2pir=MoI2/2pir; cancel the same values  on both sides

B2/B1=6/2 =3

Explanation:

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