When magnetic field lines are close, the magnetic field is?

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Jasmine Grover

Education Journalist | Study Abroad Strategy Lead

Magnetic field lines are used to visualize and represent the direction and strength of the magnetic field in a given region of space.

  • The closer the field lines are to each other, the stronger the magnetic field is in that region.
  • This is because the density of magnetic field lines represents the strength of the magnetic field.
  • If the field lines are close together, it means that the magnetic field is changing rapidly, and there is a large magnetic force acting in the region.
  • In contrast, if the field lines are far apart, the magnetic field is weaker because there is less force acting in that region.
Magnetic field lines

In other words, the magnetic field lines behave like a map that tells us about the strength and direction of the magnetic field. When the field lines are close together, they indicate that the magnetic field is strong, and when they are far apart, they indicate that the magnetic field is weak. Therefore, the density of the magnetic field lines provides a visual representation of the strength of the magnetic field.

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CBSE CLASS XII Related Questions

  • 1.
    A 500 nm photon is incident normally on a perfectly reflecting surface and is reflected. The value of momentum transferred to the surface is:

      • \( 3.87 \times 10^{-43} \, \text{kg} \, \text{ms}^{-1} \)
      • \( 2.5 \times 10^{-30} \, \text{kg} \, \text{ms}^{-1} \)
      • \( 2.65 \times 10^{-27} \, \text{kg} \, \text{ms}^{-1} \)
      • \( 1.33 \times 10^{-27} \, \text{kg} \, \text{ms}^{-1} \)

    • 2.
      Differentiate between inductive reactance, capacitive reactance and impedance of an ac circuit.
      An ideal inductor and an ideal capacitor are connected in series across an ac voltage. Plot a graph showing variation of net reactance of the circuit with frequency of the applied ac voltage.


        • 3.
          The radius of a nucleus of mass number 125 is:

            • 6.0 fm
            • 30 fm
            • 72 fm
            • 150 fm

          • 4.
            A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is \( \sqrt{2} \), and \( \sqrt{3} \).


              • 5.
                A circular coil of 100 turns and radius \( \left(\frac{10}{\sqrt{\pi}}\right) \, \text{cm}\) carrying current of \( 5.0 \, \text{A} \) is suspended vertically in a uniform horizontal magnetic field of \( 2.0 \, \text{T} \). The field makes an angle \( 30^\circ \) with the normal to the coil. Calculate:
                the magnetic dipole moment of the coil, and
                the magnitude of the counter torque that must be applied to prevent the coil from turning.


                  • 6.
                    The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is:

                      • \( 0.5 \times 10^3 \, \text{m}^{-1} \)
                      • \( 6.0 \times 10^2 \, \text{m}^{-1} \)
                      • \( 7.5 \times 10^2 \, \text{m}^{-1} \)
                      • \( 1.5 \times 10^3 \, \text{m}^{-1} \)
                    CBSE CLASS XII Previous Year Papers

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