Question

Which of the following statement(s) is/are correct regarding magnetic field lines?

• A. The direction of the magnetic field is tangent to the field line at any point in space.
• B. Magnetic field lines are closed curves.
• C. Magnetic field lines represent zero field strength if they are parallel and equidistant.
• D. The degree of closeness of the field lines at a point is the relative strength of magnetic field strength at that point.

Answer 1

Answer: (A), (B), (D)

The correct options are
A The direction of the magnetic field is tangent to the field line at any point in space.
B Magnetic field lines are closed curves.
D The degree of closeness of the field lines at a point is the relative strength of magnetic field strength at that point.

The direction of the magnetic field is tangent to the field line at any point in space.They originate from the north pole and end at south pole outside the magnet and start at the south pole and ends at the north pole inside the magnet, thus forming a closed curve. The strength of the magnetic field is shown by the degree of closeness of the field lines. Closer the field lines, more the magnetic field strength. Magnetic field lines are closer near the poles, so, magnetic field near the poles is the strongest.