Two sources of emf `6 V` and internal resistance `3 Omega` and `2 Omega` are connected to anexternal resistance `R` as shown. If potential difference across battery `A` is zero, then the value of `R` is

Two batteries one of the emf 3V , internal resistance 1Omega and the other of emf 15 V , internal resistance 2Omega are connected in series with a resistance R as shown. If the potential difference between points a and b is zero, the resistance R in Omega is

Two batteries one of the emf 3V , internal resistance 1Omega and the other of emf 15 V , internal resistance 2Omega are connected in series with a resistance R as shown. If the potential difference between points a and b is zero, the resistance R in Omega is

Two batteries one of the emf3V, internal resistance In and the other of emf l SV, internal resistance 2Omega are connected in series with a resistanceR as shown. If the potential difference between points a and b is zero, the resistance R is :

A shortage battey with an emf of 10V and an internal resistance 1Omega is connected across an extenal resistance R and liberates of 9W power. Find the potential difference across the teminals of the battery and the value or values of R.

Two batteries of emf 4 V and 8 V with internal resistances 1Omega and 2Omega are connected in a circuit with a resistance of 9Omega as shown in figure. The current and potential difference between the points P and Q are

Two batteries of emf 4 V and 8 V with internal resistances 1Omega and 2Omega are connected in a circuit with a resistance of 9Omega as shown in figure. The current and potential difference between the points P and Q are

Two batteries one of the emf 3V, internal resistance 1 ohm and the other of emf 15 V , internal resistance 2 ohm are connected in series with a resistance R as shown . If the potential difference between a and b is zero the resistance of R in ohm is

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

Two cells with the same emf E and different internal resistances r_(1) and r_(2) are connected in series to an external resistances R . The value of R so that the potential difference across the first cell be zero is