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 temperature of the cold junction of a thermocouple is 0oC and the temperature of the hot junction is ToC. The relati...If the length of the wire is doubled, then the specific resistance will be :-...The e.m.f. of a cell is 2.0 volt and the internal resistance is 0.1ohm. It is connected with a resistance of 3.9ohm. The...A current passes through a wire of non-uniform cross-section. Which of the following quantities are independent of the c...If 2 bulbs rated 2.5 W − 110 V and 100 W − 110 V are connected in series to a 220 V supply then...