Question

Magnetic field lines represent uniform field strength when they

• A. The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points
• B. Magnetic field lines are closed curves
• C. If magnetic field lines are parallel and equidistant, they represent zero field strength
• D. Relative strength of magnetic field is shown by the degree of closeness of the field lines

Answer 1

The correct option is C If magnetic field lines are parallel and equidistant, they represent zero field strength

- Two magnetic field lines do not intersect. If they do intersect, it means that there are two possible directions for the magnetic field at the point of intersection of the field lines, which is not possible for an isolated bar magnet.

- They represent uniform field strength when they are parallel and equidistant from each other.

- The degree of closeness of the field lines represents the strength of the magnetic field and not its uniformity. Closer the magnetic field lines, more the strength of the magnetic field.