By a cell a current of $0.9\, A$ flows through $2\, ohm$ resistor and $0.3\,A$ through $7\, ohm$ resistor. The internal resistance of the cell is ............ $\Omega$
Medium
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 SolutionAs the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity
- 2If the length of the filament of a heater is reduced by $10\%$, the power of the heater willView Solution
- 3In the given figure each plate of capacitance $C$ has partial value of chargeView Solution
- 4View SolutionOhm's law fails in
- 5$A$ current $I$ flows through a uniform wire of diameter $d$ when the mean electron drift velocity is $V$. The same current will flow through a wire of diameter $d/2$ made of the same material if the mean drift velocity of the electron is :View Solution
- 6Two identical fuses are rated at $10\,A$. If they are joinedView Solution
- 7Two square metal plates $A$ and $B$ are of the same thickness and material. The side of $B$ is twice that of $A$. These are connected as shown in series. If the resistances of $A$ and $B$ are denoted by $R_A$ and $R_B,$ then $(R_A/R_B)$ isView Solution
- 8View SolutionWhen a potential difference is applied across the ends of a linear metallic conductor
- 9If the potential difference between $B$ and $D$ is zero, the value of $x$ is $\frac{1}{n} \Omega$. The value of $n$ is .......View Solution
- 10A heater of $220\, V$ heats a volume of water in $5\,\min$ time. A heater of $110\, V$ heats the same volume of water in ............... $min$View Solution