NEET | 2013Current Electricity and Electrical InstrumentHard
Question
The resistances of the four arms P,Q, R and S ina Wheatstone′s bridge are 10 ohm, 30 ohm, 30 ohmand 90 ohm, respectively. The e.m.f. and internalresistance of the cell are 7 volt and 5 ohmrespectively. If the galvanometer resistance is50 ohm, the current drawn from the cell will be :-
Options
A.2.0 A
B.1.0 A
C.0.2 A
D.0.1 A
Solution
Total resistance of Wheatstone bridge
Current through cell
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
100 cells, each of e.m.f. 5 V and internal resitance 1 Ω, are to be arranged so as to produce maximum current in a ...Two long straight parallel wires, carrying (adjustable) current I1 and I2, are kept at a distance d apart. If the force ...An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the requ...For the circuits shown in figures I and II, the voltmeter reading would be...A copper wire stretched so as to make it 0.1% longer. The percentage increase in the resistance of the wire is : -...