Along vertical wire in which a current is flowing produces a neutral point with the earth’s magnetic field at a distance of 5 cm from the wire. If the horizontal component of the earth’s magnetic induction is 0.18 gauss, then the current in the wire is:
Text Solution
Verified by ExpertsB
The magnetic induction 
due to current 
ampere in a long straight conductor at a distance 
metre from it is given by:
Here, 
cm 
metre
gauss
At the neutral point, the magnetic induction due to earth’s horizontal component is equal and opposite to that due to current in the conductor.
or 
gauss
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