Question 18: NCERT Solutions for 12th Class Physics: Chapter 5-Magnetism and Matter
A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north df east. The magnetic meridian of the place happens to be 10° west of ” the geographic meridian.The earth’s magnetic dip is zero. Locate the line of neutral points (ignore the thickness of the cable). (At neutral points, magnetic field due to a current-carrying cable is equal and opposite to the horizontal component of earth’s magnetic field.)
Solution:
The neutral point can be achieved at a location above cable, where magnetic field of cable is balanced by earth’s magnetic field BH.
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NCERT Solutions for 12th Class Physics: Chapter 5-Magnetism and Matter