The magnetic field due to a straight conductor of uniform cross&hyphen;section of radius a and carrying a steady current is represented by

Question

The magnetic field due to a straight conductor of uniform cross&hyphen;section of radius a and carrying a steady current is represented by (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

The magnetic field at a point outside the straight conductor is given by

B = \frac{μ _{0} i}{2 π r}

It means

B \propto \frac{1}{r}

(if

r > a

)
The magnetic field at a point inside the conductor is

B = \frac{μ _{0} i \times r}{2 π a ^{2}}

or

B \propto r

(if

r < a)

Q. The magnetic field due to a straight conductor of uniform cross‐section of radius a and carrying a steady current is represented by

The magnetic field at a point outside the straight conductor is given by B=2πrμ0​i​ It means B∝r1​ (if r>a ) The magnetic field at a point inside the conductor is B=2πa2μ0​i×r​ or B∝r (if r<a)

The magnetic field at a point outside the straight conductor is given by
$B = \frac{μ _{0} i}{2 π r}$
It means $B \propto \frac{1}{r}$
(if $r > a$ )
The magnetic field at a point inside the conductor is
$B = \frac{μ _{0} i \times r}{2 π a ^{2}}$
or $B \propto r$ (if $r < a)$