10.3b Potentiometer & Balance Length | AS DC Circuits | Cambridge A Level Physics

[@lynnn7237]

Thank you so much!! This video helps a lot by explaining all my confusion!

[@BOBO_4869]

Good video

[@physicsworld7218]

When u have drawn a graph between V and length so its not passing through origin and voltage is 12 or high when length is 0 or less so how they directly related

[@heratan2151]

the origin will gonna be starting from L, so if u reflect the graph u can see their relationship

[@heratan2151]

when V=12 R=0 since all energy is still there , but across the l it's gonna dissipate all the voltage.

[@heratan2151]

so R is the max when V is the lowest (0)

[@physicsworld7218]

Mam i have a question.

[@iLoveSnoopy135]

i dont understand why if Vb=V2, A=0 at 10:10

[@BOBO_4869]

Take it as gravitational potential energy, if there isn't a difference in heights, the ball won't fall

[@Imran-iwnl-Haider]

Laughed at your explanation of pd of resistor😂

[@physicsworld7218]

Kindly reply me

[@gonayor992]

How can you say that V is proportional to L but you draw a graph that suggests otherwise? Aren't you contradicting yourself?

[@cursedstone7939]

Because she is measuring potential and not potential difference . If there was no length then there would be no resistance hence no V drop so 12 before and after is same hence 0. But because she is measuring potential here so even at length 0 , she measures 12 v . I hope this is understandable and can someone also plz tell me if I am correct

[@alexanderyap8831]

i dont understand what your saying

[@heratan2151]

I understand ur struggles, btw what she means is: 1. V here is the potential difference (energy used to push the charge across x=0 and L) is proportional to the length , since as L increases, R increases and more V needed to push the charges across the L) 2. Since potential & potential difference are not the same, the graph she draw is the potential value at any x on the wire. 3. to make this easier i think we may use delta V for p.difference and V for potential value