InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
The earth's field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 xx 10^(22) JT^(-1) located at its centre. Check the order of magnitude of this number in some way. |
|
Answer» Solution :Using the formula for field B on the normal bisector of a dipole of magnetic moment , we find `|vecB_E| = (mu_0)/(4pi)* (|vecm|)/(R^3)` Taking `m= 8 XX 10^(22) J T^(-1) , r ` (radius of EARTH) = `6.4xx10^6` m, we get `B_E = 3 xx 10^(-5)` , which resembles with the order of magnitude of the observed field on the earth . Thus, claim that earth.s field is DUE to a dipole of magnetic moment `8 xx 10^(22)` J `T^(-1)` is true. |
|