A. 3500C,6900C

B. 3500C,7000C

C. 3000C,6000C

D. 3000C,5900C

While connecting 6 cells in a battery in series,ina tape recorder,by mistake one cell is connected with reverse polarity.If the effective resistance of load is 24 ohm and internal resistance of each cell is one ohm and emf 1.5V,the current delivered by the battery is

A potentiometer having a 4m long wire is connected to the terminals of a battery of constant output voltage. A Leclanche cell has a balancing length of 1m. If the length of the potentiometer wire is increased by 1m, then the position of the null point is

Two wires of the same material but of different diameters carry the same current I. If the ratio of their diameters is 2 : 1, then the corresponding ratio of their mean drift velocities will be

In a thermo couple the temperature of the cold junction is 15^{0}C.If the temperature of inversion is 485^{0}C,the neutral temperature of the thermo couple is

The resistance of a conductor is 1.08Ω.To reduce it to 1Ω,the resistance that must be connected is