# A very long straight wire carries a current of 5.2 A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire? - Physics

Sum

A very long straight wire carries a current of 5.2 A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire?

#### Solution

Data: I = 5.2 A, a = 0.031 m, mu_0/(4pi) = 10^-7T m/A

The magnetic induction,

B = (mu_0"I")/(2pi"a") = mu_0/(4pi) (2"I")/"a" = 10^-7 xx (2(5.2))/(3.1 xx 10^-2)

= 3.35 × 10-5 T

Concept: Magnetic Field Produced by a Current in a Circular Arc of a Wire
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#### APPEARS IN

Balbharati Physics 12th Standard HSC Maharashtra State Board
Chapter 10 Magnetic Fields due to Electric Current
Exercises | Q 7 | Page 249