For a cell of $e.m.f.$ $2\,V$, a balance is obtained for $50\, cm$ of the potentiometer wire. If the cell is shunted by a $2\,\Omega $ resistor and the balance is obtained across $40\, cm$ of the wire, then the internal resistance of the cell is ............. $\Omega $
Easy
Download our app for free and get started
(b) $r = \left( {\frac{{{l_1} - {l_2}}}{{{l_1}}}} \right)R = 0.5\,\Omega $.
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
- 1View SolutionThe material of wire of potentiometer is
- 2The equivalent resistance of the circuit shown below between points $a$ and $b$ is $..........\Omega$View Solution
- 3When the switch $S$, in the circuit shown, is closed, then the value of current $i$ will be ................. $A$View Solution
- 4Resistance across $A B$ as shown in figure is ............. $\Omega$View Solution
- 5Figure shows a part of an electric circuit. The potentials at points $a , b$ and $c$ are $30\,V , 12\,V$ and $2\,V$ respectively. The current through the $20 \Omega$ resistor will be $........\,A$View Solution
- 6There is a current of $1.344\, amp$ in a copper wire whose area of cross-section normal to the length of the wire is $1\,m{m^2}$. If the number of free electrons per $c{m^3}$ is $8.4 \times {10^{22}}$, then the drift velocity would beView Solution
- 7The current from the battery in the given circuit is ................ $A$View Solution
- 8A heating element has a resistance of $100\,\Omega $ at room temperature. When it is connected to a supply of $220\,V,$ a steady current of $2\,A$ passes in it and temperature is $500\,^oC$ more than room temperature. What is the temperature coefficient resistance of the heating element?View Solution
- 9Drift velocity ${v_d}$ varies with the intensity of electric field as per the relationView Solution
- 10The electric resistance of a certain wire of iron is $R$. If its length and radius are both doubled, thenView Solution