
The magnetic field lines due to a bar magnet are correctly shown in
A. 
B. 
C. 
D. 
Answer
162.6k+ views
Hint:
In this problem we will use the concept of magnetism of a bar magnet and the magnetic field lines of the bar magnet. A bar magnet's field lines will move from its north pole to its south pole. Field lines that begin close to a pole's borders will hang around the bar magnet longer than field lines that begin closer to the pole's centre.
Complete step by step solution:
In a bar magnet, there are two poles named ‘North-Pole’ and ‘South-Pole’ such that the magnetic field lines originate from the North pole and end at the South pole outside the magnet.
But inside a magnet, the magnet field lines start from the South pole and end at the North pole. Since options (A) and (B) do not contain magnetic field lines inside a magnet that’s why options (A) and (B) are incorrect.
Now, option (C) has magnetic lines inside a magnet but in opposite direction i.e., from North to South which is wrong, therefore, option (C) is also incorrect.
Thus, the magnetic field lines due to a bar magnet are shown as: -

Hence, the correct option is (D).
Therefore, the correct option is D.
Note:
Since this is a problem related to a uniform magnetic field and magnetic lines of forces hence, it is essential that given options must be analyzed very carefully to give a precise explanation. While writing an explanation for this kind of conceptual problem, always keep in mind to provide the exact reasons in support of your explanation.
In this problem we will use the concept of magnetism of a bar magnet and the magnetic field lines of the bar magnet. A bar magnet's field lines will move from its north pole to its south pole. Field lines that begin close to a pole's borders will hang around the bar magnet longer than field lines that begin closer to the pole's centre.
Complete step by step solution:
In a bar magnet, there are two poles named ‘North-Pole’ and ‘South-Pole’ such that the magnetic field lines originate from the North pole and end at the South pole outside the magnet.
But inside a magnet, the magnet field lines start from the South pole and end at the North pole. Since options (A) and (B) do not contain magnetic field lines inside a magnet that’s why options (A) and (B) are incorrect.
Now, option (C) has magnetic lines inside a magnet but in opposite direction i.e., from North to South which is wrong, therefore, option (C) is also incorrect.
Thus, the magnetic field lines due to a bar magnet are shown as: -

Hence, the correct option is (D).
Therefore, the correct option is D.
Note:
Since this is a problem related to a uniform magnetic field and magnetic lines of forces hence, it is essential that given options must be analyzed very carefully to give a precise explanation. While writing an explanation for this kind of conceptual problem, always keep in mind to provide the exact reasons in support of your explanation.
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