Physics, asked by bharthi22, 1 year ago

let r be the distance of a point on the axis of a magnetic dipole from its centre. the magnetic field at such a point is proportional to?​

Answers

Answered by jeehelper
1

The magnitude of bar magnet can be calculated by following equation:

B = 10^(-7) 2Mr/(r^2 – l^2)^2               ………… (i)

In this equation, it is clear that magnetic field does not have simple relation with the radius r. In the denominator, r has power 4. If we look at expression with attention, it can be observed that B has inverse relation with r.

Answered by ariston
0

Given:

r is the distance of a point of axis of magnetic dipole from center

Formula Used:

B=\frac{2\mu_oMr}{4\pi(r^2-l^)^2}

Where, M is the magnetic dipole moment.

Calculations:

Let l be the length of the dipole. Then, if l >>r

B\propto \frac{1}{r^3}

Thus, Magnetic field at the point would be inversely proportional to cube of the distance from the center of dipole.

Learn more about: Magnetic dipole

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