# A dc source of emf E1 = 100 V and internal resistance r = 0.5 W, a storage battery of emf E2 = 90 V and an external resistance R are connected as shown in figure. For what value of R no current will pass through the battery ?

Question:

A dc source of emfE $_{1}=100 \mathrm{~V}$ and internal resistance $r=0.5$ $\Omega$, a storage battery of emf $\mathrm{E}_{2}=90 \mathrm{~V}$ and an external resistance $R$ are connected as shown in figure. For what value of $\mathrm{R}$ no current will pass through the battery ?

1. $5.5 \Omega 2.$3.5 \Omega$3.$4.5 \Omega$4.$2.5 \Omega$Correct Option: 3 Solution: ### Related Questions • A circuit to verify Ohm’s law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the circuit: View Solution • Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity$\rho_{C}, \rho_{T}, \rho_{M}$and$\rho_{A}$respectively. Then : View Solution • To verify Ohm’s law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained : If$\mathrm{V}_{\mathrm{o}}$is almost zero, identify the correct statement: View Solution • A current of$5 \mathrm{~A}$passes through a copper conductor (resistivity)$=1.7 \times 10^{-8} \Omega \mathrm{m}$) of radius of cross-section$5 \mathrm{~mm}$. Find the mobility of the charges if their drift velocity is$1.1 \times 10^{-3} \mathrm{~m} / \mathrm{s}$. View Solution • In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. One may canclude that: View Solution • Space between two concentric conducting spheres of radii$a$and$b(b>a)$is filled with a medium of resistivity$\rho$. The resistance between the two spheres will be : View Solution • In a conductor, if the number of conduction electrons per unit volume is$8.5 \times 10^{28} \mathrm{~m}^{-3}$and mean free time is$25 f s$(femto second), it’s approximate resistivity is$\left(\mathrm{m}_{0}=9.1 \times 10^{-31} \mathrm{~kg}\right)$View Solution • A$200 \Omega$resistor has a certain color code. If one replaces the red color by green in the code, the new resistance will be : View Solution • The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure: What is the value of current at$\mathrm{t}=4 \mathrm{~s}\$ ?

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