Magnetic Field

Step 1: Use Ampère’s law for magnetic field.
For a long straight wire with a uniformly distributed current, the magnetic field at a distance from the wire is given by where is the permeability of free space, is the current, and is the distance from the center of the wire. Step 2: Calculate the ratio of the magnetic fields.
The magnetic field at point (at distance ) is The magnetic field at point (at distance ) is Step 3: Calculate the ratio.
The ratio of the magnetic fields is Final Answer: The ratio of the magnetic fields at points and is