What is the basic difference between magnetic field, magnetic field lines, magnetic flux and magnetic field intensity?

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Jasmine Grover

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The basic difference between magnetic field, magnetic field lines, magnetic flux, and magnetic field intensity is as follows:

  1. Magnetic field: Magnetic field is a region in which a magnet or a current-carrying conductor experiences a force. It is a vector quantity that describes the strength and direction of the magnetic force at any point in space.
  2. Magnetic field lines: Magnetic field lines are imaginary lines that are used to represent the direction and strength of the magnetic field. They are always drawn in such a way that the tangent to the line at any point gives the direction of the magnetic field at that point. The density of the magnetic field lines indicates the strength of the magnetic field.
  3. Magnetic flux: Magnetic flux is the product of the magnetic field strength and the area perpendicular to the magnetic field. It is a scalar quantity that measures the number of magnetic field lines passing through a given area.
  4. Magnetic field intensity: Magnetic field intensity, also known as magnetic field strength, is the magnetic field per unit length of a current-carrying conductor. It is a vector quantity that describes the strength and direction of the magnetic field at a point in space due to a current-carrying conductor.

In summary, magnetic field and magnetic field intensity are vector quantities that describe the strength and direction of the magnetic field, while magnetic field lines are imaginary lines that represent the direction and strength of the magnetic field. Magnetic flux is a scalar quantity that measures the number of magnetic field lines passing through a given area.

difference between magnetic field, magnetic field lines, magnetic flux and magnetic field intensity

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CBSE CLASS XII Related Questions

  • 1.
    Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

      • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
      • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
      • Assertion (A) is true, but Reason (R) is false.
      • Both Assertion (A) and Reason (R) are false.

    • 2.
      Assertion : Photoelectric effect is a spontaneous phenomenon. Reason (R): According to the wave picture of radiation, an electron would take hours/days to absorb sufficient energy to overcome the work function and come out from a metal surface.

        • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
        • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
        • Assertion (A) is true, but Reason (R) is false.
        • Both Assertion (A) and Reason (R) are false.

      • 3.
        Four long straight thin wires are held vertically at the corners A, B, C and D of a square of side \( a \), kept on a table and carry equal current \( I \). The wire at A carries current in upward direction whereas the current in the remaining wires flows in downward direction. The net magnetic field at the centre of the square will have the magnitude:

          • \( \dfrac{\mu_0 I}{\pi a} \) and directed along OC
          • \( \dfrac{\mu_0 I}{\pi a \sqrt{2}} \) and directed along OD
          • \( \dfrac{\mu_0 I \sqrt{2}}{\pi a} \) and directed along OB
          • \( \dfrac{2\mu_0 I}{\pi a} \) and directed along OA

        • 4.
          The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

            • \( \dfrac{3h}{2\pi} \)
            • \( \dfrac{2h}{\pi} \)
            • \( \dfrac{h}{\pi} \)
            • \( \dfrac{h}{2\pi} \)

          • 5.

            The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

              • Production of AC is economical.
              • AC can be easily and efficiently converted from one voltage to another.
              • AC can be transmitted economically over long distances.
              • AC is less dangerous.

            • 6.
              Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

                • attract with a force \( \frac{F}{2} \)
                • repel with a force \( \frac{F}{2} \)
                • repel with a force \( F \)
                • attract with a force \( F \)
              CBSE CLASS XII Previous Year Papers

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