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24 March, 11:28

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 four times its original value.

It increases to three times its original value.

It decreases to one-fourth its original value.

It decreases to one-third its original value.

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  1. 24 March, 12:52
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    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
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