Current Electricity and Electrical InstrumentHard
Question
The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its stand and cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5 Ω. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is
Options
A.
B.
C.
, where I is the current in the potentiometer wire.
, where I is the current in the potentiometer wire.D.
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
An inductor (L = 0.03 H) and a resistor (R = 0.15 kΩ) are connected in series to a battery of 15V EMF in a circuit ...A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in...A time varying i is speed through a resistance R as shown in figure. The total generated in the resistance is...The radius of the circular loop is ′a′. Magnetic field is increasing at the constant rate α Magnetic fi...The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and ...