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Solution


Q.

Pick out the incorrect statement about magnetic lines of force.
1 Magnetic lines of force start from the North Pole and end on the South Pole.  
2 No two magnetic lines of force can intersect each other.  
3 Magnetic lines of force are far away from each other at the poles.  
4 Magnetic lines of force are closed continuous curves.  

Ans.

(3)

Magnetic lines of forces are closed continuous curves. They are nearer to each other at the point where magnetic field is strongest and far from each other where magnetic field is weak. At poles, magnetic lines of forces are nearest to each other because magnetic field is strongest at the pole.

No two magnetic lines of forces intersect with each other. At the point of intersection, the compass needle would point towards two directions, which is not possible.

They are continuous, forming closed loops without beginning or end, which start from the north pole and end at the south pole. Hence, statement (c), i.e., Magnetic lines of force are far away from each other at the poles is the incorrect statement.