First slide

Magnetic field due to a straight current carrying wire

Question

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

Moderate

A
B
C
D

Solution

The magnetic field due to a straight conductor of uniform cross-section of radius o carrying a steady current i is represented by $B = (\frac{μ_{0} i}{2 {πa}^{2}}) r for 0 < a < r$
and $B = \frac{μ_{0} i}{2 πr} for r > a$
So, curve (a) is the correct choice

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