Two cells of e.m.f `E_1 and E_2` have internal resistance `r_1 and r_2` respectively. What is the corresponding formula for the series combination?

Two cells, of e.m.f. 2E and E, and internal resistance 2 r and r respectivley are connected in parallel. Obtain the expression for the equivalent e.m.f and the internal resistance of the combination?

In the circuit show in the figure E,F,G and H are cells of e.m.f. 2,1,3 and 1 V and their internal resistances are 2,1,3 and 1Omega respectively. Calculate the potential difference across the terminals of each of the cells G and H.

n cells, each having emf. E and internal resistance r are connected in parallel. What is the net internal resistance of the combination?

n cells of e.m.f E and internal resistance r are connected in series with an external resistance R . the current will increase n times that of a single cell, if

A battery of e.m.f E and internal resistance r sends a current I_1 and I_2 , when connected to an external resitance of R_1 and R_2 respectively. Find the e.m.f and internal resistance o the battery.

Two cells, having the same emf, are connected in series through an external resistance R. Cells have internal resistance r_(1) and r_(2) (r_(1) gt r_(2)) respectively. When the circuit is closed, the potentail difference across the first cell is zero the value of R shown in the figure

Two cells of the same e.m.f. E but internal resistance r_1 and r_2 are connected in series to an external resistor R (fig. EP 3.25). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero?

Two batteries of e.m.f. 4V and 8V with internal resistances 1 Omega and 2 Omega are connected in a circuit with a resistance of 9 Omega as shown in figure. The current and potential difference between the points A and B

Ten identical cells each of e.m.f. E and internal resistance r are connected in series to form a closed circuit. An ideal voltmeter connected across three cells, will read

Two cells each of e.m.f. 1.1 V and internal resistance 2Omega are joined in parallel with a resistance of 10Omega . Find the curent throught the resistance and through each cell.