Basics of Network Theory (Solved Problem 2)

Network Theory: Basics of Network Theory (Solved Problem 2)
Topics discussed:
1) The resistance of a cube-shaped material between any of its opposite faces is 2Ω. If this cube is stretched in one direction by applying a linear force, it's original length doubles. Find the new resistance between oppositely stretched faces.

Music:
Axol x Alex Skrindo - You [NCS Release]

#NetworkTheoryByNeso

[amansajwan]

Sir your teaching is awesome but we have one problem you are not giving solutions of hw problems. Please solve those problems also

[gateprep]

you must provide solutions atleast because in the cmnts solution of every viewer differs so please listen this problem.

[hiteshmourya]

Before closing the switch Rtotal is greater than after closing the switch so the total current will increase and current and voltage through r2 will increase and voltage through r1 will decrease and current may be same because some current is going through r3

[RohitKumar-poec]

Sir, where can i get the solution of all the homework problems.

[aram]

current through r1 before closing the switch is v/(r1+r2)
current through r1 after closing the switch is vr3/(r1r2+r1r3+r2r3) or v/(r1r2/r3+r1+r2) which is clearly lesser than before so it will decrease
since current has decreased so will voltage
as we know that equivalent resistance in parallel is smaller than the smallest one so total resistance will decrease and so the current for r2 will increase and so the voltage

[surajkantsharma]

A-q
B-r
C-r
D-r
Everyone getting confused for C and D but when switch s is open then voltage division rule Applied so whatever voltage V is given to the circuit it's get divided across R1 and R2.
So before when switch are open V1 and V2 is the voltage across R1 and R2
When switch is closed then V1 is the voltage across R1 and R3 and V2 is across R2 that is same voltage.

[ARRun]

ans: q p q p. I ran simulation to check my answer and its correct!!

[Balasanjeevi-oveu]

correct ans
(a) Current through 𝑅1 : (q) will decrease (I/2)
(b) Current through 𝑅2 : (r)will remain same (I)
(c) Voltage across 𝑅1 : (q) will decrease ( IR1...after adding )
(d) Voltage across R2: (r)will remain same (IR2)

[manishankarmukherjee]

Sir pls explain also the answer of hw questions 🙏 then it will be helpful for us to check our answer is correct or not

[shibinpj]

Sir, can u provide answers of hw problem...

[dharmeshparmani]

#Nesoacademy Is this the correct answer q r q r . ???

[anusmitsaha]

Please provide solutions of the homework problems

[jayapandis]

Current through R1 will decrease and voltage decreases
current through R2 will remain same and voltage increase

[sahanwazrahaman_ece]

The correct option (D) a – q, b – p, c – q, d – p Explanation: When switch is close, some current now move through R3 hence current through R1 will decrease and potential difference across R1 will decrease. Also effective current through R2 will increases because of presence of R3 in parallel to R1. As in parallel connection, resistance decreases, hence current will increase. ∴ current through R2 will increase potential difference R2 will also increase. ∴ a → q c → q b → p d → p.

[shammaparveen]

Sir
Pls provide the solutions....
I'm not able to get correct anwer.

[ail]

q p q p. (1) we can get I = V/(R1+R2+k), k=(R1*R2)/R3, implies that new current is always smaller than original one. (2) total R decrease, I increase, so must be increase. (3) & (4) voltage simply depend on total resistance of each path.

[devanshpawar]

network theorem ka wait kab tak karna padenga means,
superposition
thevenin
Norton

[apostolosmavropoulos]

a - q, b - p , c - q . d - p ? (edit** i think (a) question matches with (s) answer)

[priyashrivastava]

Plz provide homework problem solutions

[PunmasterSTP]

Solved problem 2? More like "Very much thank you!"