Question

How will the strength of magnetic field change when the point where the magnetic field is to be determine is move away from the straight wire carrying current?

Answer 1

Answer:

As the strength of magnetic field varies inversely with the square of the distance of the point from the elementary portion of the conductor carrying current so magnetic field strength will reduced at the point where the magnetic field is to be determined, is moved away from the straight wire carrying constant current.

Answer 2

The strength will decrease with power of 2  of the distance from the straight current carrying wire.

Explanation:

From Biot-Savart's law:

The magnetic field is proportional to the current and inversely proportional to the distance to the point from the wire.

$B=\frac{\mu_o I dl sin \theta}{4\pi r^2}$

Thus, as the distance increases, the strength will decrease. It will follow inverse square law.

Learn more about: Biot-Savart law

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