What is the difference between magnetic field and magnetic field lines?

Jasmine Grover logo

Jasmine Grover

Education Journalist | Study Abroad Lead

Magnetic fields and magnetic field lines are related to each other and are used to describe the behaviour and properties of magnetic fields. The main differences between magnetic fields and magnetic field lines are as follows – 

Magnetic Field Magnetic Field Lines
Magnetic field is a vector quantity that describes the strength and direction of the magnetic force on a charged particle or a magnetic material. Magnetic field lines are a visual representation of the direction and strength of the magnetic field in a given region of space.
Magnetic field is measured in Tesla (T) or Gauss (G). Magnetic field lines have no units.
Magnetic field is continuous and exists throughout a region of space where a magnetic field is present. Magnetic field lines are discrete and do not exist outside the region where a magnetic field is present.
Magnetic field lines point in the direction of the magnetic field at any given point in space. Magnetic field lines are a closed loop that begins and ends on magnetic poles.
The strength of the magnetic field can be calculated at any point in space by measuring the magnetic field vector. The density of magnetic field lines indicates the strength of the magnetic field, with closer lines indicating a stronger field.
The magnetic field is used to calculate the magnetic force on a charged particle or a magnetic material. Magnetic field lines are used to visualize and represent the direction and strength of the magnetic field in a given region of space.

In summary, the magnetic field is a mathematical vector that describes the strength and direction of the magnetic force, while magnetic field lines are a visual representation of the magnetic field that provides information on the direction and strength of the magnetic field at different points in space.

Read More:

CBSE CLASS XII Related Questions

  • 1.
    Capacitors are manufactured with certain standard capacitances and working voltages. However, these standard values may not be the ones that are actually needed in a particular application. Two or more capacitors can be grouped in series or in parallel to achieve desired capacitance and voltage. When connected in series, the total capacitance decreases while the voltage rating increases, whereas in parallel connections, the total capacitance increases and maintains the same voltage rating. A capacitor stores energy in the electric field between its plates and stored energy is proportional to the square of the voltage and capacitance $U = \frac{1}{2}CV^2$, where symbols have their usual meanings.
    Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }


      • 2.
        A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.


          • 3.
            Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.


              • 4.
                An astronomical telescope consists of two converging lenses. One of them of large aperture and large focal length is called objective lens and the other one, of smaller focal length and smaller aperture is called the eyepiece. It is used to see distant objects which are not seen clearly with naked eyes. The image formed by the objective lens acts as an object for the eyepiece and the final image produced by the eyepiece is magnified.


                  • 5.
                    Read the following paragraph and answer the questions that follow.
                    In an experiment with convex lens of focal length f, the screen is fixed at a distance D from the object. A student slowly moves the lens away from the object towards the screen and finds that she is able to form sharp image of the object for two positions of the lens. The distance between these two positions of the lens is d.


                      • 6.
                        Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

                          • The total charge of the two spheres is conserved.
                          • Both spheres attain the same potential.
                          • The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
                          • The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$
                        CBSE CLASS XII Previous Year Papers

                        Comments


                        No Comments To Show