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Magnetic Field Lines - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

Quick Facts

  • Magnetic field lines is considered one of the most asked concept.

  • 23 Questions around this concept.

Solve by difficulty

The magnetic lines of force inside a bar magnet

The Magnetic lines of force inside a bar magnet

 Three identical bars A, B and C are made of different magnetic materials.  When kept in a uniform magnetic field, the field lines around them look as follows :

Make the correspondence of these bars with their material being diamagnetic (D),ferromagnetic (F) and paramagnetic (P) :

Below figures (1) and (2) represent lines of force. Which is a correct statement

In the case of bar magnet which  of the following is true about magnetic lines of force :

The lines of force due to a bar magnet

The magnetic field line due to a bar magnet is correctly shown in

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The magnetic line of force inside a bar magnet 

S is the surface of a lump of magnetic material.
A. Lines of B are necessarily continuous across S.
B. Some lines of B must be discontinuous across S.
C. Lines of H are necessarily continuous across S.
D. Lines of H cannot all be continuous across S.

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Concepts Covered - 1

Magnetic field lines

Important points regarding Magnetism-

  • The earth behaves as a magnet with the magnetic field lines pointing from the geographic south to the north.
  • When a bar magnet is freely suspended, it points in the north-south direction. The tip which points to the geographic north is called the north pole and the tip which points to the geographic south is called the south pole of the magnet.
  • There is a repulsive force when like poles of two magnets are brought close together and there is an attractive force when unlike poles of two magnets are brought close together.
  • The north and south pole cannot be separated by splitting the magnet into two parts.

         i.e. If a magnet is broken into a number of pieces each piece becomes a magnet.

  • It is possible to make magnets out of iron and its alloys.

Magnetic field-

Space around a magnetic Pole or magnet or current-carrying wire within which its effect can be experienced.

Magnetic field lines-

The magnetic field line is not real. The magnetic field lines are a visual and intuitive realization of the magnetic field.

Properties of magnetic field lines-

  • The magnetic field lines of a magnet form continuous closed loops. Outside the magnet, magnetic field lines start from the north pole and end at the south pole, whereas inside the magnet its direction is from south pole to north pole.
  • The tangent to the magnetic field line at a given point represents the direction of the net magnetic field ($\vec{B}$) at that point.

       For the below figure, the tangent to the magnetic field line at point P represents the direction of the net magnetic field ($\vec{B}$) at point P.

        Magnetic filed lines

  • The larger the number of magnetic field lines crossing per unit area, the stronger is the magnitude of the magnetic field ($\vec{B}$) at that region.
  • The two magnetic field lines do not intersect at any point.

 

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Magnetic field lines

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