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.

Question

Ewing

Physics

30 October, 00:04

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.

+1

Answers (1)

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Jacqueline Liu · Answer 1

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

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.

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.