Question

The value of the magnetic field at a distance x from a long straight current - carrying conductor is proportional to :

• A. $x$
• B. $x^2$
• C. $1/x^2$
• D. $1/x$

Answer 1

Answer: (D)

$1/x$

Magnetic field at x distance is

$B=\frac{{\mu }_{o}i}{2\pi x}$

$B\propto \frac{1}{x}$