Download App
In order to determine the $e.m.f.$ of a storage battery it was connected in series with a standard cell in a certain circuit and a current $I_1$ was obtained. When the battery is connected to the same circuit opposite to the standard cell a current $I_2$ flow in the external circuit from the positive pole of the storage battery was obtained. What is the $e.m.f$. $\varepsilon_1$ of the storage battery? The $e.m.f$. of the standard cell is $\varepsilon_2$.
  • A$\varepsilon_1 = \frac{{{I_1} + {I_2}}}{{{I_1} - {I_2}}}\, \varepsilon_2$
  • B$\varepsilon_1 = \frac{{{I_1} + {I_2}}}{{{I_2} - {I_1}}}\, \varepsilon_2$
  • C$\varepsilon_1 =\, \frac{{{I_1} - {I_2}}}{{{I_1} + {I_2}}} \,\varepsilon_2$
  • D$\varepsilon_1 = \, \frac{{{I_2} - {I_1}}}{{{I_1} + {I_2}}} \, \varepsilon_2$
Medium
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Download App

Similar Questions

  • 1
    The resistance of the filament of an electric bulb changes with temperature. If an electric bulb rated $220\, volt$ and $100\, watt$ is connected $(220 \times 0.8)$ $volt$ sources, then the actual power would be
    View Solution
  • 2
    The electric field $E$, current density $J$ and conductivity $\sigma$ of a conductor are related as
    View Solution
  • 3
    A cylindrical metal wire of length $l$ and cross sections area $S$, has resistance $R$, conductance $G$, conductivity $\sigma$ and resistivity $\rho$. Which one of the following expressions for $\sigma$ is valid
    View Solution
  • 4
    $10$ resistors, each of resistance $R$ are connected in series to a battery of $emf$ $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is :
    View Solution
  • 5
    Two bulbs $X$ and $Y$ having same voltage rating and of power $40\, watt$ and $60\, watt$ respectively are connected in series across a potential difference of $300\, volt$, then
    View Solution
  • 6
    Emf is most closely related to
    View Solution
  • 7
    The supply voltage to room is $120\ V$. The resistance of the lead wires is $6\,\Omega$ . A $60\ W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\ W$ heater is switched on in parallel to the bulb? ............. $V$
    View Solution
  • 8
    Ratio of thermal energy released in two resistor $R$ and $3 R$ connected in parallel in an electric circuit is :
    View Solution
  • 9
    Assertion : Long distance power transmission is done at high voltage.

    Reason : At high voltage supply power losses are less.

    View Solution
  • 10
    A silver and zinc voltameter are connected in series and a current $i$ is passed through them for a time $t$ liberating $W\, gm$ of zinc. The weight of silver deposited is nearly ..............$W$
    View Solution