Question

Which one of the following statements best describes the nature of the field lines due to a bar magnet?

• A. Field lines start from the north pole and end on the south pole. Any number of field lines can pass through a point
• B. Field lines start from the north pole and end on the south pole. Only one field line passes through a point
• C. Field lines are continuous lines passing inside and outside the magnet. Only one field line passes through a point
• D. Field lines are continuous lines passing inside and outside the magnet. Any number of field lines can pass through a point

Answer 1

The correct option is C Field lines are continuous lines passing inside and outside the magnet. Only one field line passes through a point

The properties of magnetic filed lines are that they start from north pole and end at south pole (outside the magnet). But they flow from south to north pole inside the magnet forming a continuous closed loop. They are very near to each other where the magnetic field is strong whereas they are far away from each other where magnetic field is weak. At poles, magnetic field is the strongest. Thus the magnetic lines of forces are the nearest at the poles. No two magnetic line of forces intersect with each other.

Thus correct answer is option C.