Two batteries $A$ and $B$ each of $e.m.f.$ $2\, V$ are connected in series to an external resistance $R = 1 \,ohm$. If the internal resistance of battery $A$ is $1.9\, ohms$ and that of $B$ is $0.9\, ohm$, what is the potential difference between the terminals of battery $A$ ............. $V$
Medium
Download our app for free and get started
$i = \frac{{2 + 2}}{{1 + 1.9 + 0.9}} = \frac{4}{{3.8}}\,A$
For cell $A$ $E = V + ir$ $ \Rightarrow $ $V = 2 - \frac{4}{{3.8}} \times 1.9 = 0$.
Download our appand 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.*
Similar Questions
- 1The heat developed in an electric wire of resistance $R$ by a current $I$ for a time $t$ isView Solution
- 2For the arrangement of the potentiometer shown in the figure, the balance point is obtained at $a$ distance $75\,cm $ from $A$ when the key $k$ is open. The second balance point is obtained at $60\, cm$ from $A$ when the key $k$ is closed. Find the internal resistance (in $ \Omega$) of the battery $E_1$.View Solution
- 3A bulb has specification of one kilowatt and $250\, volts$, the resistance of bulb is .................. $\Omega$View Solution
- 4A wire has a non-uniform cross-section as shown in figure.A steady current flows through it. The drift speed of electrons at points $P$ and $q$ is $v_P$ and $v_Q$.View Solution
- 5The percentage error in the reading of the voltmeter in the figure shown here is nearly ............ $\%$View Solution
- 6When the resistance $R$ (indicated in the figure below) is changed from $1 \,k \Omega$. to $10 \,k \Omega$, the current flowing through the resistance $R'$ does not change. What is the value of the resistor $R'?$View Solution
- 7View SolutionElectric current has both magnitude and direction. It is a
- 8Different combination of $3$ resistors of equal resistance $R$ are shown in the figures.View Solution
The increasing order for power dissipation is:
- 9The current in the given circuit is ............ $A$View Solution
- 10A potentiometer consists of a wire of length $4\, m$ and resistance $10\,\Omega $. It is connected to a cell of $e.m.f.$ $2\, V$. The potential difference per unit length of the wire will be ............. $V/m$View Solution