Current Electricity and Electrical InstrumentHard
Question
What is the equivalent resistance across A and B in the figure shown, if R = 3Ω?
Options
A.9 Ω
B.12 Ω
C.15 Ω
D.8 Ω
Solution
R1 = R2 = R3 = R4 = R5 = R
R′ & R2 are in series
Their equivalent resistance,
R′ = R1 + R2 = 2R
Now R′ & R3 in are parallel
Their equivalent resistance, R′′ is given by
R″, R5 & R4 are in series
∴ Rf = R″ + R5 + R4 = R + R + 2R/3 = 8R/3,
Since R = 3Ω
∴ Rf = 8 ×
= 8Create 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 resistances of the four arms P,Q, R and S ina Wheatstone′s bridge are 10 ohm, 30 ohm, 30 ohmand 90 ohm, respec...A potentiometer circuit is set up as shown. the potential gradient, across the potentiometer wire, is k volt/cm and the ...The resistance between points A and B is...In the circuit shown in figure, the 5Ω resistance develops 20.00 cal/s due tothe current flowing through it. The he...The total current supplied to the circuit by the battery is...