What would be the highest and the lowest equivalent resistances possible by joining these resistors ? 4ohm , 8 ohm , 12 ohm , 24 ohm

What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistances 4 Omega, 8 Omega, 12 Omega, 24 Omega ?

The total resistance between x and y in ohm is:-

For the network of resistance shown in the figure the equivalent resistance of the network between the points A and B is 18 ohm. The value of unknown resistance R is :

400 J of heat is produced in 4 s in a 4.0ohm resistor. Find the potential difference across the resistor.

A regular pyramid of square is made of eight identical wires each resistance 12 Omega shown in the figure. The terminals A and B are the mid-point of the corresponding sides. Find equivalent resistances between the terminals A and B in ohms.

The resistance of galvanometer is G ohm and the range is 1 volt. The value of resistance used to convert it into a voltmeter of ragne 10 volt is:-

The resistance of a N//10 KCI solution is 245 ohms. Calculate the specific conductance and the equivalent conductance of the solution if the electrodes in the cell are 4 cm apart and each having an area of 7.0 sq cm.

A potentiometer circuit is setup as shown. The potential gradient across the potentiometer wire is k "volt"//cm and the ammeter present in the circuit reads. 1.0 A When two-way key is switched off. The balance point, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths l_(2) cm and l_(2) cm respectively. The magnitudes, of the resistors R and X , in ohm, are then, equal, respectively, to

An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrode is measured with the help of an ideal voltmetar, and which can be varied by moving jockey 'J' on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2omega . The resistance of 100 cm long potentiometer wire is 8 omega . The photo current is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm^(2) at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an indepdent circuit. The wavelength of various colours is as follows : |{:("Light",underset("Violet")(1),underset("Blue")(2),underset("Green")(3),underset("Yellow")(4),underset("Orange")(5),underset("Red")(6)),(lambda "in" Årarr,4000-4500,4500-5000,5000-5500,5500-6000,6000-6500,6500-7000):}| When radiation falls on the cathode plate a current of 2muA is recorded in the ammeter. Assuming that the vecuum tube setup follows ohm's law, the equivalent resistance of vacuum tube operating in this case when jockey is at end P.

In the adjoining network of resistors, each is of resistance r ohm, the equivalent resistance between points A and B is–