A. 1.14Ω

B. 2Ω

C. 4.12Ω

D. 56Ω

Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1:2and if no resistance value is fractional the largest of the three resistances in ohms is

One junction of thermo couple is at 0^{0}C and the other junction is heated .Maximum current in the thermo couple is observed when hot junction is at 240^{0}C.The temperature of the hot junction at which the direction of current reverses is

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

A galvanometer of resistance 100Ω gives full scale deflection with 5mA current.To convert it into a 5 volt range voltmeter,the value of resistance connected in series is

Four bulbs each marked 40 W. 250 V are connected in series with 250 V source. The total power output is