Question

Derive magnetic field intensity. Derive an expression for the magnetion field intensity at a point lying on the equitional line of a ber imagnet?

Answer 1

Answer:

The magnetic field of a bar magnet on the axis is given by the expression

Explanation:

Let there be a unit North Pole placed at any point the magnetic forces acting as per coulomb’s law are

Similarly at the south pole the force exerted would be as in equation,

Thus the strength at point B will be difference in force experienced at north pole and south pole

But dipole moment m = 2l.qm

So axial magnetic field

But for bar magnet l<<<r hence

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