Question

For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be

• A. $0^\circ$
• B. $90^\circ$
• C. $180^\circ$
• D. $45^\circ$

Answer 1

Answer: (B)

$90^\circ$

Answer 2

The magnetic field due to small element conductor of length is given by
$dB= \frac{μ_0}{4π}\frac{idl sinθ}{r^2}$​
This value will be maximum when
$sin\ θ=1=sin\ 90\degree$
$θ=90\degree$

So, the correct answer is (B): 90$^{\circ}$