In a graph between current i and voltage v, find the portion corresponding to negative resistance.

Considering that the temperature and physical conditions are constant, Ohm’s law claims that the flowing current via any conductor is directly proportional to the potential difference across the ends. Ohm’s law can be described mathematically as:

V = IR

Here,

  • V = Voltage
  • I = Current
  • R = Resistance

Solution of the Above Equation

Thus, Negative resistance = – (V/I) = [V/(– I)]

Therefore, the part is CD where resistance is negative.


Related Questions

  1. In An Arrangement Of Resistances, Find Effective Resistance Between Points A and B.
  2. What Is Effective Resistance?
  3. X and Y, which are two resistors, with resistances of 2 Ω and 3 Ω respectively are first connected in parallel and then in series. In both cases, the voltage that is supplied is 5 V. (i) Illustrate a circuit diagram to show the combination of resistors. (ii) Calculate the amount of voltage across 3 Ω resistor in the series combination of resistors.
  4. Find The Highest And Lowest Total Resistance Of A Combination Of Four Coils With Resistances 4 Ohms, 8 Ohms, 12 Ohms, 24 Ohms.
  5. What is Null Voltage?
  6. If R, C And L Are Fundamental Quantities In A Circuit Like Resistance, Capacitance And Inductance In W, Then Find Dimensional Formula For Resistance And Capacitance.
  7. Draw An Electric Circuit With A Cell, Key, Ammeter, A Resistor (Series) Of 2 Ohm With a Combination Of Two Resistors (4 Ohm Each) In Parallel And A Voltmeter Across Parallel Combination.

Do Check:

CBSE CLASS XII Related Questions

  • 1.
    In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

      • \(10\ \text{N/C}\) along \(+x\)
      • \(10\ \text{N/C}\) along \(-x\)
      • \(50\ \text{N/C}\) along \(+x\)
      • \(50\ \text{N/C}\) along \(-x\)

    • 2.

      A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

        • the induced current will flow in the anticlockwise direction.
        • the induced current will flow in the clockwise direction.
        • no induced current will flow in the solenoid.
        • the magnet will fall with a constant velocity.

      • 3.
        A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.


          • 4.
            Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

              • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})\)
              • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})\)
              • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})\)
              • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})\)

            • 5.

              An electron is revolving around a proton in a circular orbit of radius $r$. Using classical physics, prove that the ratio of value of the angular momentum and the value of magnetic moment of electron revolving in the orbit is a constant.


                • 6.

                  A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:

                  (I) the formation of maxima and minima in the diffraction pattern, and

                  (II) why the maxima go on becoming weaker and weaker with its increasing number $n$.

                    CBSE CLASS XII Previous Year Papers

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