Current Electricity and Electrical InstrumentHard
Question
The current through the ammeter shown in figure is 1 A. If each of the 4Ω resistor is replaced by 2Ω resistor, the current in circuit will become nearly :
Options
A.10/9 A
B.5/4 A
C.9/8 A
D.5/8 A
Solution
Req = 2 + 
+ RA = 9 + RA
I =
⇒ 1 = 
⇒ RA = 1Ω
if 4Ω replace by 2Ω resistance then
Req = 2 +
+ 1 = 9Ω
I =
amp
+ RA = 9 + RA I =
⇒ 1 = ⇒ RA = 1Ωif 4Ω replace by 2Ω resistance then
Req = 2 +
+ 1 = 9Ω I =
ampCreate 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
The resistance of a wire is 5 ohm at 50oC and 6 ohm at 100oC. The resistance of the wire at 0oC will be...In which of the above cells, the potential difference between the terminals of a cell exceeds its emf....When the power delivered by 100 volt battery is 40 watts the equivalent resistance of the circuit is :...A current carrying is placed vertically and a particle of mass m with charge Q is released from rest. The particle moves...A cell of emf E having an internal resistance r is connected to an external resistance R. The potential difference V acr...