A. 4

B. 6

C. 8

D. 10

Two wires of same material and same length have their resistances in the ratio 5:7.The ratio of the masses of the wires is

In a thermo couple the cold junction is at 30^{0}C.The temperature of inversion is found to be 540^{0}C,Then the neutral temperature is

A cell of emf 2V and negligible resistance is connected in series with a resistance of 5 Ω, and a potentiometer wire of resistance 10 ohm. What is the potential drop per cm if the length of the potentiometer wire is 10 m. The emf a cell which is balanced by 750 cm long wire is

An ammeter whose resistance is 180 Ω shows full scale deflection when the current is 2mA.The shunt required to convert into an ammeter reading 20 mA is (in ohm)

The maximum potential that can be measured with a voltameter of resistance 1000Ω is 6V.Resistance that must be connected to measure a potential of 30V with it is