Four Probe | Viva Voce | Practical File

[@Param_Sir]

Your work is really awesome and helpful for students 👍
Keep it up @Sir

[@AllLabExperiments]

Thanks dear

[@VIDYAVIJAYKUMAR-ci4eg]

Thank you 👍 sir 😁😊

[@gaurav24224]

Very helpful sir ❤... thanks

[@AllLabExperiments]

Thanks. For physics lectures you can download our app GradXY from google playstore.

[@gaurav24224]

@@AllLabExperiments sure👍

[@psiphizone2020]

Can you please tell what is the relationship b/w p = RA/l
Formula and p =( V/I )*2πs
Formula

[@alintamaryshaji2637]

Can you pls tell
Relation b/w band gap energy and refractive index of a material

[@AllLabExperiments]

I think there is no direct one to one relation. Refractive index is influenced by the fact how energy transfers from atom to atom in a structure. Band gap is the energy which is absorbed by a material. It stays there for some time and then come back. Therefore, the energy gap and time to stay in a level are two different things. They may be influenced by a common factor in a material but its not a universal relation.

[@alintamaryshaji2637]

Thank u

[@PSTWFB]

Four probe resistivity measurement! does ln and log mean the same thing! g7(w/s)!
ua-cam.com/video/zn_wADSRnnc/v-deo.html

[@AllLabExperiments]

@@PSTWFB yes they are same

[@anuskabhowal1157]

What are the other conventional ways of doing it without four probes method?

[@AllLabExperiments]

Normal two probe method. You place electrodes across a sample and find its conductivity or resistivity

[@rupeshkarar282]

Very helpful

[@KomalSHARMA-dg8xg]

Very helpful video thanks sir

[@ishwadhwa6207]

Good job

[@jdora6848]

Why we are using four probes only ?
My viva exam question

[@AllLabExperiments]

Useful for thin films. Connection on one side and more accurate because resistance of wires can be eliminated.

[@sangramsorryavanshi7248]

Sir why we take germanium for the experiment?

[@AllLabExperiments]

Just a sample material. Other materials may also use.

[@ansumanpaikera2557]

Very nice ❤️

[@hariharabhoi529]

Spacing among probes kyun constant le rhe hai

[@AllLabExperiments]

Coz jo final formula h wo wahi consider krke bnaya gya h.

[@hariharabhoi529]

Spacing different rakhenge toh kya hoga

[@AllLabExperiments]

@@hariharabhoi529 formula different hoga. N wo symmetry ki wajah se hi correctipn factor G7 nikalna easy h nahi to wo or mushkil ho jata

[@Easycooking921]

Last ques wrong h sir

[@AllLabExperiments]

That is correct. Please check.

[@eshuji779]

First comment 😎

[@AllLabExperiments]

Cool. Thanks

[@rakshitsinghal4760]

@Eshu Ji congratulations 🥳