Question

Magnetic lines of force
A. Form closed circuit
B. Cannot intersect
C. Are crowded together near poles
D. All of the above are correct

Answer 1

Hint: The magnetic lines of force are the imaginary line that represents the direction of the magnetic field. The magnetic field lines originate at the north pole and ends at the south pole. The magnetic lines of force are crowded where the magnetic field strength is the maximum.

Complete answer:
The magnetic lines of force are the imaginary line that represents the direction of the magnetic field. We have seen that the magnetic field lines of the bar magnet originate from the one pole and cease at the other pole. This represents the direction of the magnetic field.

To answer this question, let’s check every option one by one as follows.
We know that the magnetic monopoles do not exist. Every magnet has two poles: South Pole and North Pole. The magnetic field lines originate at the north pole and end at the south pole. Therefore, we can see that the magnetic lines of force form a closed loop between the north pole and the south pole. Thus, the option A is correct.

We know that the magnetic lines of force do not intersect in their path from North Pole to South Pole. Therefore, the option B is also correct.

The magnetic lines of force are crowded where the magnetic field strength is the maximum. We know that the maximum magnetic field strength is at the poles of the magnet. Therefore, the magnetic lines of forces are crowded near the poles. Thus, the option C is also correct.
Hence, all the three options are correct.

So, the correct answer is option D.

Note: Remember, magnetic monopoles never exist. If we cut the magnet in the two parts, the end of the cut section becomes the pole that we cut off from the magnet. This process continues even when we cut the magnet in very small pieces.