A cylinder of radius R is carrying a constant current. The correct plot of magnetic field with distance (d) from the axis of the cylinder is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2)
$B=\frac{μ_0Id}{2πR^2}\,:d≤R⇒B∝d:d≤R$
$=\frac{μ_0I}{2πd}:d>R⇒B∝\frac{1}{d}:d>R$