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Can you find very high resistance accurately with the help of a Metre bridge?

Metre bridge is an instrument that works on the principle of Wheatstone Bridge and is used to find unknown resistance.

  • The meter bridge is sensitive when the resistance of all 4 bridge arms is in the same order, and it turns insensitive to extremely high and very low resistances.
  • The deflection of the meter bridge will be minimal when resistance is too high. This indicates that the currents are too low.
  • As a result, the Metre bridge cannot be used to accurately measure extremely high resistance.

Related Questions

  1. What Is Null Voltage?
  2. Why Carey Foster Bridge Is So Sensitive?
  3. Meter Bridge or Slide Wire Bridge is a practical form of?

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CBSE CLASS XII Related Questions

  • 1.
    Read the following paragraph and answer the questions that follow.
    A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.

      • 2.
        Write two advantages of reflecting telescope over refracting telescope.

            View Solution

          • 3.
            An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.

                View Solution

              • 4.
                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.

                  • 5.
                    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 $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$
                      View Solution

                    • 6.
                      With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

                          View Solution
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