n cells, each having emf e, are connected in series what is the emf of the combination?

Three capacitors each of capacitance 9 pF are connected in series. What is the total capacitance of the combination?

Twelve cells each having the same e.m.f are connected in series and are kept to a closed box. Some of the cell are connected in reverse order .The battery is connected in series with an ammeter an external resistance R and two cells of the same type as an in the battery .The current when they and support each other is 3 ampere and current is 2 ampare when the two oppose each other. How many cells are connected in servese order ?

n cells, each of emf E are connected in parallel. The effective emf of the parallel combination is:

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

Three capacitors each of capacitance 9 pF are connected in series. What is the potential difference across each capacitor if the combination is connected to a 120 V supply?

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 capacitors A and B of capacitance 4muf and 2muF respectivley are connected in series with a battery of e.m.f. 100 V. The connections are broken and the like terminanls of the capacitors are then joined. Find the final charge on each capacitor.