The strength of the magnetic field around a long straight wire, carrying current, is

Question

The strength of the magnetic field around a long straight wire, carrying current, is (A) Same everywhere around the wire at any distance (B) Inversely proportional to the distance from the wire (C) Inversely proportional to the square of the distance from the wire (D) Directly proportional to the square of the distance from the wire

Tardigrade Admin · Accepted Answer

The strength of magnetic field around a straight current carrying wire is given by

B = \frac{μ _{0}}{2 π} . \frac{I}{r}

∴ B \propto \frac{1}{r}

Therefore, magnetic field due to a straight current carrying wire is inversely proportional to the distance from the wire.

Q. The strength of the magnetic field around a long straight wire, carrying current, is

Same everywhere around the wire at any distance

Inversely proportional to the distance from the wire

Inversely proportional to the square of the distance from the wire

Directly proportional to the square of the distance from the wire

The strength of magnetic field around a straight current carrying wire is given by B=2πμ0​​.rI​ ∴B∝r1​ Therefore, magnetic field due to a straight current carrying wire is inversely proportional to the distance from the wire.

The strength of magnetic field around a straight current carrying wire is given by
$B = \frac{μ _{0}}{2 π} . \frac{I}{r}$
$∴ B \propto \frac{1}{r}$
Therefore, magnetic field due to a straight current carrying wire is inversely proportional to the distance from the wire.