In the circuit shown, the value of each resistance is $r$, then equivalent resistance of circuit between points $A$ and $B$ will be
AIPMT 1990, Medium
Download our app for free and get started
(d) The given circuit can be simplified as follows.
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 resistance of a bulb filmanet is $100\,\Omega$ at a temperature of $100\,^o C$. If its temperature coefficient of resistance be $0.005$ per $^o C$, its resistance will become $200\,\Omega$ at a temperature of ................ $^oC$View Solution
- 2A current of $2\, A$ flows in a system of conductors as shown. The potential difference $(V_A -V_B)$ will be ................ $\mathrm{V}$View Solution
- 3A solenoid is at potential difference $60\, V$ and current flows through it is $15$ ampere, then the resistance of coil will be ............ $\Omega$View Solution
- 4Consider a $72\, cm$ long wire $AB$ as shown in the figure. The galvanometer jockey is placed at $P$ on $A B$ at a distance $x cm$ from $A$. The galvanometer shows zero deflection.View Solution
The value of $x,$ to the nearest integer, is ..... $cm$
- 5View SolutionTwo bulbs of equal wattage, one having carbon filament and the other having a tungsten filament are connected in series to the mains, then
- 6A potential difference of $V$ is applied at the ends of a copper wire of length $l$ and diameter $d$. On doubling only $d$, drift velocityView Solution
- 7The length of a given cylindrical wire is increased by $100 \%$. Due to the consequent decrease in diameter the change in the resistance of the wire will be .................. $\%$View Solution
- 8Two identical cells, when connected either in parallel or in series gives same current in an external resistance $5\,\Omega$. The internal resistance of each cell will be $.............\,\Omega$.View Solution
- 9Find the error in reading of voltmeter ................ $\%$View Solution
- 10In a potentiometer arrangement, a cell gives a balancing point at $75\, cm$ length of wire. This cell is now replaced by another cell of unknown emf. If the ratio of the emf's of two cells respectively is $3: 2$, the difference in the balancing length of the potentiometer wire in above two cases will be.........$cm .$View Solution