Question

Derive an expression for magnetic field on axial line of bar magnet

Answer 1

Answer:

the magnetic field of a bar magnet on the axis is given by the expression to a unit north pole placed at any point magnetic force is acting as per coulombs law and three does the strength. We will be difference in force experienced North pole and South Pole

Answer 2

Answer:I m attaching two photos hope you understand

Explanation: