CBSE Class 12-science Answered
If the Earth's existing magnetic field is considered due to a large, circular, current-carrying loop in the Earth's interior, then what is the plane in which the current-carrying loop lies and what is the direction of current in it?
Asked by Topperlearning User | 01 Jun, 2015, 01:49: PM
Expert Answer
The direction of the magnetic field at the centre of the Earth is from North to South (as shown in the given figure). Therefore, to produce such a field configuration, the current-carrying loop should be perpendicular to the magnetic field lines passing through the centre of the earth. Therefore, the direction of the current has to be from East to West.
Hence, the current-carrying loop can be considered to lie on the equatorial plane and the direction of the current in the loop is from East to West. 
Answered by | 01 Jun, 2015, 03:49: PM
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