The resistance of all the wires between any two adjacent dots is $R$. Then equivalent resistance between $A$ and $B$ as shown in figure is :
Diffcult
Download our app for free and get started
As no current will pass through $\mathrm{CD}$, $CD$ arm assume to be open circuit.
$R_{1 A B}=\frac{\frac{7 R}{3} \times \frac{7 R}{3}}{\frac{7 R}{3}+\frac{7 R}{3}}=\frac{\frac{7 R}{3} \times \frac{7 R}{3}}{2 \times \frac{7 R}{3}}=\frac{7 R}{6}$
$R_{1 A B}=\frac{7 R}{6}$
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
- 1A $100\, watt$ bulb working on $200 \,volt$ and a $200\, watt$ bulb working on $100\, volt$ haveView Solution
- 2The resistance in the two arms of a meter bridge are $5\,\Omega $ and $R\,\Omega $, respectively. When the resistance $R$ is shunted with an equal resistance, the new balance point is at $1.6\, l_1$. The resistance $‘R’$ is ................. $\Omega$View Solution
- 3A $25\, watt$, $220\, volt$ bulb and a $100\, watt$, $220\, volt$ bulb are connected in parallel across a $220\, volt$ line. Which bulb will glow more brightlyView Solution
- 4The following circuit consist of a $5 \,\mu F$ capacitor, having charge $50 \,\mu C$ as shown. The switch is closed at $t=0$. The value of current in $2 \,M \Omega$ resistor at $t=0$ is ........... $\mu A$View Solution
- 5In this figure the resistance of the coil of galvanometer $G$ is $2\,\Omega$. The emf of the cell is $4\,V$. The ratio of potential difference across $C_1$ and $C_2$ is:View Solution
- 6A cell of internal resistance $r$ drives current through an external resistance $R$ . The power delivered by the cell to the external resistance will be maximum when:View Solution
- 7The drift velocity of electrons in silver wire with cross-sectional area $3.14 \times 10^{-6}\,m ^2$ carrying a current of $20\,A$ is. Given atomic weight of $Ag =108$ , density of silver $=10.5 \times 10^3\,kg / m ^3..........\times 10^{-4} m / sec$.View Solution
- 8Two cells of emf $2\, E$ and $E$ with internal resistance $r _{1}$ and $r _{2}$ respectively are connected in series to an external resistor $R$ (see $figure$). The value of $R ,$ at which the potential difference across the terminals of the first cell becomes zero isView Solution
- 9The equivalent resistance of the given circuit between the terminals ${A}$ and ${B}$ is $....\Omega$View Solution
- 10The length of a potentiometer wire is $\ell $. A cell of emf $E$ is balanced at a length $\ell /3$ from the positive end of the wire. If the length of the wire is increased by $\ell /2$ at what distance will the same cell give a balanced pointView Solution