KCET 2025 Physics Paper

The magnetic field B around an infinitely long, straight conductor carrying a steady current can be described using the equation:
B=‌

µ0i

2πr

where:
B is the magnetic field,
µ0 is the permeability of free space,
i is the current through the conductor, and
r is the perpendicular distance from the conductor.
From this equation, we can see that B is inversely proportional to r, which implies:
B∝‌

1

r

This relationship is characteristic of a rectangular hyperbola, meaning the graph of magnetic field B versus distance r will form a hyperbolic shape.
This relationship is characteristic of a rectangular hyperbola, meaning the graph of magnetic field B versus distance r will form a hyperbolic shape.
B=‌

µ0i

2πr