If the magnetic lines of force are shaped like arcs of conc…

Physics Magnetism and Matter Magnetic Field Lines, Magnetic Field, Induction, Moment MCQ (Single Correct)

If the magnetic lines of force are shaped like arcs of concentric circles with their centre at point O in a certain section of a magnetic field:

The intensity of the field in this section should at each point be inversely proportional to its distance from point O

The intensity of the field in this section should at each point be inversely proportional to square of its distance from point O

The intensity of the field in this section should at each point be inversely proportional to cube of its distance from point O

Nothing can be said

Text Solution

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The correct answer is:

To prove this we will calculate work done by electric force in a close loop .

during displacement AD and BC work done by electric force as electrostatic is perpendicular to displacement.

Work done during
Work done during
Total work done

Close loop work done should be zero

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