The resistance of two conductors in series is 40 ohm and their resistance becomes 7.5 ohm when connected in parallel. What are the resistance?

A set of n identical resistors, each of resistance R ohm when connected in series, has effective resistance X ohm and when connected in parallel the effective resistance is Y ohm. The relation between R, X and Y is given by-

The equivalent resistance of two resistances in series is four times the equivalent resistance when they are in parallel. If one of the resistances is R, then what would be the resistance of the other?

Calculate the resistances of two resistor which when connected in a series provide equivalent resistance 5Omega and parallel provide equivalent resistance 1.2Omega .

The emf of a dry cell is 1.5 V , when an ammeter and a resistance are connected with the series combination of two dry cells in series,then the ammeter reads 1A,and when the cells are connected in parallel the reading of the ammeter becomes 0.75A What is the internal resistance of the dry cell? Draw the circuit diagrams?

The equivalent resistance of two coils connected in series and in parallel are 12Omega and 5/3 Omega respectively. Calculate the value of each resistance.

A number of cells of negligible resistance are connected with battery of 12V with two resistances in series.A voltmeter of resistances 5000 Omega while connected with these two resistances reads 4V and 6V respectively.Find the magnitude of the resistances.

Two cells one of emf 1.4 V and internal resistance 0.6 Omega the other of emf 2.5. V and internal resistance 0.3 Omega are connected in parallel and the combination is connected in series with an external resistance of 4 Omega . What is the current through this resistance?

A potentiometer wire has a length 10m and a resistance of 4 ohm. A cell of emf 2V and a resistance box are connected in series with it. Calculate the resistance to be introduced in the box, so as to get a potential gradient of 0.1Vm^-1 .

With two resistances 2 Omega and 3 Omega In parallel a third resistance of 4 Omega is connected in series.Find their equivalent resistance.