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Answer the question regarding earth's magnetism: 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 :(E) Using FORMULA `B_(e) = (mu_(0)) /(4pi ) ((m)/( r^3) )` and placing the values `m= 8 xx 10^(22) J//T` (or `Am^(2)), r=R_(e)=6.4 xx 10^(6)` m when we find out value of `B_(e)`, it comes out to be 0.3052 G (Gauss) which is quite close to experimentally measured value. This means that magnetic field of bar magnet with magnetic dipole MOMENT `8 xx 10^(22) J//T`. | |