Two tangent galvanometers A and B have coils of radii `8cm` and `16cm` respectively and resistance `8ohm` each. They are connected in parallel to a cell of emf `4V` and negligible internal resistance. The deflections produced are `30^@` and `60^@` respectivley. A has 2 turns. What is the number of turns in B?

Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 Omega each. They are connected in parallel with a cell of emf 4 V and negligible internal resistance. The deflectioins porduced in the T.G.’s A and B are 30^@ and 60^@ respectively. If A has 2 turns, then B must have

A voltmeter has a resistance 30 Omega . What will be its reading, when it is connected across a cell of emf 2 V having internal resistance 10 Omega ?

A potentiometer wire of length 100 cm has resis tance of 10 ohms. It is connected in series with a resistance R and a cell of emf 2V and negligible in ternal resistance. The circuit is as shown below. - What is the principle of a potentiometer ?

Four cells each of emf 2V and internal resistance 1 ohm are connected in parallel with an external resistance of 6 ohm. The current in the external resistance is

Two cells of emfs 1.5 V and 2.0v having internal resistance 0.2 Sigma and 0.3 Sigma respectively are connected in parallel . Calculate the emf and internal resistance of the equivalent cell .

Two cells of emfs 1.5 V and 2.0v having internal resistance 0.2 Sigma and 0.3 Sigma respectively are connected in parallel . Calculate the emf and internal resistance of the equivalent cell .

A potentiometer wire has a length of 4 and a resistance of 8 ohm. It is connected in series with a cell of e.m.f. 2 V and internal resistance 2 ohm. The potential drop per unit length of the wire is

Two tangent galvanometers, which are identical except in their number of turns, are connected in parallel. The ratio of their resistance of the coils is 1 : 3 . If the deflections in the two tangent galvanometers are 30^@ and 60^@ respectively, then the ratio of their number of turns is