In a closed circuit, the e.m.f. and internal resistance of the generator are E and r respectively. If the external resistance in the circuit is R, then Ohm's law has the form

The resistances of the four arms P,Q,R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be

The resistance of the four arms P,Q,R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively.The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively.If the galvanometer resistance is 50 ohm, the current drawn from the cell will be

The current in a circuit with a cell of e.m.f 6 V and internal resistance 0.1 Omega is 2 A. Find the value of the external resistance in it.

An external resistance R is connected to a cell of internal resistance r . The current in the circuit is maximum when :

An external resistance R is connected to a cell of internal resistance r. The current in the circuit is maximum when

An external resistance R is connected to a cell of internal resistance r. The current in the circuit is maximum when :

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 cell of e.m.f (E) and internal resistance (r) is connected in series with an external resistance (nr.) then the ratio of the terminal p.d. to E.M.F is