Question

Compute the magnitude of the magnetic field of a long, straight wire carrying a current of 1 A at a distance of 1 m away from it. Compare it with the Earth's magnetic field.

Answer 1

Step-by-step explanation:

Magnetic field due to a long wire

B = μ x 2I / 4π r where I is current and μ / 4π = 10⁻⁷ , r is distance from the wire

Putting the values

B = 10⁻⁷ x 2 x 1 / 1

= 2 x 10⁻⁷ T .

earth's magnetic field = 45 x 10⁻⁶ T = 450 x 10⁻⁷

So the magnetic field is 225 times less strong than earth's magnetic field .