A current I (t) flows around the circular ring in Fig. 11.8. Derive the general formula for the power radiated (analogous to Eq. 11.60), expressing your answer in terms of the magnetic dipole moment, m(t), of the loop.

Figure 11.8

Equation 11.60

Solution 11P

Step 1 of 4</p>

To find the general formula for the power radiated in terms of magnetic dipole moment for a circular ring.

Step 2 of 4</p>

Let us consider the magnetic dipole moment of the earth changing with time is given by,

….(1)

And, the amplitude of dipole moment is,

….(2)