N Identical Cells, Each Of E.M.F E And Internal Resistance R, Are Joined In Series To Form A Closed Circuit. The Potential Difference Across Any One Cell Is ______

As given in the question, the current in the circuit:

 \(\begin{array}{l}\frac{n\varepsilon}{nr}\\\ \frac{\varepsilon}{r}\end{array}\)

Electric circuit

The potential difference across the cell can be calculated as VA – VB

 \(\begin{array}{l}V_{A} – V_{B}\\\Rightarrow -\varepsilon + ir \\\Rightarrow -\varepsilon +\frac{\varepsilon }{r} \times r = 0 \end{array}\)


Related Questions

  1. Write Two Differences Between Emf And Potential Difference.
  2. Define 1 volt, Potential difference.
  3. Sensitivity of potentiometer can be increased by___________
  4. How does a potentiometer measure EMF?
  5. What is potential difference of a cell?

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CBSE CLASS XII Related Questions

  • 1.

    A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

      • 80 Wb
      • 16 Wb
      • \(8 \times 10^{-2}\) Wb
      • \(8 \times 10^{-3}\) Wb

    • 2.
      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 \(-x\)

      • 3.

        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 (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.


          • 4.

            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.

            • 5.
              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:

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

              • 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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