Coulomb's Law and its Vector form | explained in HINDI
In this Physics video lecture in Hindi for class 12 we explained Coulomb's law in electrostatics and its vector form. During the derivation of Coulomb's law we see that the magnitude of the electrostatic force between two charges is directly proportional to the product of the magnitudes of two charges and inversely proportional to the square of the distance between them. Its vector form gives the direction of force along with its magnitude.
Coulomb's constant is having value 9 × 10 ^9 Nm^2 C^(-2).
Absolute permittivity of free space and is equal to 8.854 ×10^(-12) C^2 N^(-1) m^(-2).
Vector form Coulomb's law can be expressed as
F ⃗ = 1/(4πε0 ) (q1 q2)/r^2 r ̂
Or, F ⃗ = 1/(4πε0 ) [ (q1 q2)/r^3]. r ⃗
Other important information on this chapter :
Electric charge : the property of a proton or an electron, which gives rise to electrostatic force between them, is called electric charge .
It is a scalar quantity.
In S.I., its unit is coulomb (C).
A proton possesses +e charge, whereas, an electron possesses -e charge, where, e =1.6 × 10^(-19) C.
Additive nature of charge : - The total charge on an object is equal to the algebraic sum of all the electric charges distributed in that object.
If q1, q2, ……….. qn are the charges distributed in an object, then the total charge on that object,
q = q1+ q2+ …….+ qn
Quantization of charge : - The fact that all observable charges are always some integral multiple of elementary charge e, is known as quantization of charge.
Hence, any observable charge,
q = ± n e
Law of conservation of charge :- Law of conservation of charge states that for an isolated system, the net charge always remains constant.
In other words, charge can neither be created nor be destroyed.
The principle of superposition : - This principle states that when a number of charges are interacting, the electrostatic force between two charges is not affected by the existence of the other charges and the total electrostatic force on a charge is the vector sum of all the forces due to other charges.
Relative permittivity of a medium : - It is defined as the ratio of the electrostatic force between two charges placed in vacuum or air to the electrostatic force between them placed at the same distance in that medium.
εr = F/F_m
Where, F is the magnitude of the electrostatic force between two charges placed in vacuum and F_m is the magnitude of the electrostatic force between them in a medium.
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School me to sirf exam me kya karna hai vahi sikhate hai. But. Aap real explain karte ho. Apke jesa teacher ka sath ho to students bahot aage tak ja sakta hai 🧠❤️❤️💝💓🔥💥🙌🙌🙌🙌
Wow sir Jitna aapke comment like and subscriber hai aap itna deserve Nahin Karte Hain aap isase Bhi Jyada dissolve Karte Hain wow Mujhe Yahi chij physics wala main samajh hi nahin I aapke yahan Mujhe yah ekadam clear Ho Gaya very na please channel ko Banna Karen aur Aage Bhi padhte Jaaye neet ke liye bhi thank you so much Itna Achcha Koi Nahin padha sakta hai sach mein Na beautiful explain koi nahin kar sakta hai mujhe yah physics wala Mein samajh hi nahin Aaya bilkul bhi to maine socha main School nahin kar Dun stopper ko Chhodo Rahane Dete Hain Yahan samajh Nahin Aaya Tu Kahan hai vaise bhi per FIR Main Nahin han Dekha and its amazing amazing Main To jitni Tarif Karun kam hai yah comment box Chhota pad ja raha hai itne comment a rahe hain I like it it's a raha hai yah comment box Chhota per ja raha hai I want to say something more
sir coulomb's law are defined for points charge only but in your definition point charge is not mentioned.
@edupoint.physics
7 жыл бұрын
Hello Vineeta Patel ! Yes you are absolutely correct. I missed that. Thank you for your valuable feed. God bless you.
@amansisodiya7235
5 жыл бұрын
What is point charges
@wolframalpha8634
5 жыл бұрын
@@amansisodiya7235 a point charge is that charge whose size is pretty small when compared to it's distance of separation
@poras1513
5 жыл бұрын
@@wolframalpha8634 buddy it is taken as 0 always neglect in the formula or your numericals results will come out to be wrong
This video helped a lot. Videos watched before, doesn't clear the concept. You're great teacher.
@vikasdabhade7918
3 жыл бұрын
Lol in 2021 😂
Kya explain karte ho sir maja aagya love physics by edu point
Your way of teaching is very good.😊
thank u so much sir for providing these amazing content its very easy to understand u r doing a great job thank you so much sir I'm really thankful to u stay the same always :)
Ur understanding is quite awesome 😎 big fan sir❤️
Sir you r a genius .
Sir ur way of teaching and talking are really good... After saw uR video i am ready for facing examintion regarding as always........ sir At last please provide us pdfs of topic those we learnt from u it makes us very helpful in making of self notes and saves our time 🙏🙏🙏
Crystal clear concept 😊👌
SUPPER Sir , Full conceptual.
Thank you sir 🥰🥰♥️♥️♥️very nice expalaination 🥰🥰♥️♥️
Thank you so much sir....aapke explanation biology ke students ko bahut help krte h....aapke lectures dekhne se pehle mujhe physics se bahut darr lagta tha....😊
@khushik9968
4 жыл бұрын
Ye channel boards k liye h ya phir neet k liye bhi??
@payalprasad355
4 жыл бұрын
@@khushik9968 Mainly for boards dear...
@khushik9968
4 жыл бұрын
@@payalprasad355 oh alright 👍👍 thanku🙃
You are best teacher sir😍😎😎😇👍👍👍
a lot of thanks to you for clear my confusion
Sir but vector form me ncert book me to square kra hai ap ne cube kyo kiya???
After watching many videos, now I have no doubt about r12 or r21. Thank you very much sir.
If 2 alpha- particles are separated by a distance of 10^(-3) angstrom then compare the gravitational and electrostatic force which will act between them. (given G = 6.70× 10^(-11) SI units, m=6.6×10^(-27) kg and charge= 3.2×10^(-19) c. Please solve this problem.
Love u so much as a student
Why's it said that the Coulomb's Law is applicable for the point charged?If the charges are not point ones then the distance between them would be taken from their centres.
Jordaar sir ji
Sir questions ka liye bhi ek aalag video banaeye
Sir aap vdo upload kyon nhi kr rhe hai nowadays 🙄🙏🙏🙏
Great teaching method...thank u sir
In 31:36 secs, second force is acting towards the direction of first charge, so we should have taken r12 as direction but why did you take r21?
You are great sir absolutely
thnq u so much sir
32:40 charges k sign ka matlb qa h fir? aapne direct use bahar nikal liye sign toh bas dono charges k opposite nature ko batana h lekin bahar kaise nikal liye?
Slam sir...I have a question...why we take product of charges ..?..why not addition...
Helping me in BSC.pakistan ma Acdmy or uni Jane Kr zarorat hi Ni parti ab .thank U
U have great voice and blessed with patience
Vacuum kiya hota h sir
love u Sir
wow .amazed
Thanks sir
Hi sir .. I really like way of teaching ... U r really teaching in a excellent way plz sir kindly make vdos on bsc hons paper . Plz sir make a vdo on rc coupled amplifier . I have tried a lot bt finally failed to understand the concept of this topic and I strongly believe that u r the only one from whom I can learn it very clearly . Plz sir plz plz plz.... Make a vdo on rc coupled amplifier
Sir uska notes v de digiye sir bol youtube me dikhate h
Great
sir pardeep ki books mn aur jo aap bta rhe h bha thodi si confusion h yeh r12 aur r21 kyu ho rha h aur sir aap jo explanation dete ho i love it
@adi_upsc6698
5 жыл бұрын
According to my knowledge r12 means that we are observing point 1 with respect point 2 and r21means that we are observing point 2 with respect to point 1.
Awesome 👏🏼 thank you Sir
Very nice videos thanks
i m from Pakistan and sir i always like your explanation you are brilliant
Sir numerical bhi laga kar Bata dijiye
Sir conductors nd insulators wala part is chap me ..??
Sir dono force kese same hoga suppose ak charge 1C or ak charge 10C hoga to vi?
@nishant_soni97
4 жыл бұрын
same isliye hai kyuki dono point charge considered kiya gya hai.
Sir I like u logics to understanding theory ..,....well done sir ji
Sir numerical bhi sikhaaye
Magnitude kya hota hai
This video is root for electrostatics.Thanks a lot Sir 😊
Sir is ki examples krwa dain plz plz plz ... 21.1-21.4 to plz sir
Sir plzzz next video on inverse square rule with great explanation and with best examples
sir in books the direction of F21 is r12 because the force on charge q2 due to charge q1
@edupoint.physics
6 жыл бұрын
Which book? Wo 50 saal pahle likha gaya hoga. Revision nahi hua hoga. Ya fir................ they are copy-cats.
Why's it said that Coulomb's Law is applicable for the point charged?
@Sunil-yd5wb
4 жыл бұрын
point charge is depend upon distance
Cool....very good expression. .. Awesome.👍👍
@ritikraj1086
6 жыл бұрын
sOMETHING DIFFERENt Expression ki explaination ??
@somethingdifferent212
6 жыл бұрын
Ritik Raj "way of expression"
Why we take r^2?
Bahut hi behatreen samjhaya hai guru ji
Achha ab samjh aaya r(cube) kyu hota h mere master ne kaha tha bs itna yaad rekhna ki vector form m r cuber ho jata h 😆🤣
Sir where do u live I want to prepare for jee
Nice sir Thanks a lot
Like this video bcoz it was very very helpful
Sir mere ek tution material me force f21 likha hai lekin direction r12 likha hai ye galat hai ya sahi hai please explain kijiye
@edupoint.physics
5 жыл бұрын
Hello Lalita sahu, Wo purana convention hai. Ye naya hai.
Sir kya aapke videos me jee advanced tak ke theory complete hai Or just ncert level Pls reply
@edupoint.physics
6 жыл бұрын
+Ritik Raj Khud dekh ke decide karein. I do not follow NCERT for Physics.
@ritikraj1086
6 жыл бұрын
OK sir But will you plz tell are these theory are sufficient for jee I am asking just because ,I can understand easily what you are explaining Hope u answer Thanks in advance
Nice sir
Nice sir.
@edupoint.physics
6 жыл бұрын
+abdulqudus physics Thank you very much. Aap sab ka saath himmat deta hai.
Sir ji aapse ek request hai ki ek video NDA k lie bnaye.
thanks lotttt sir
@edupoint.physics
7 жыл бұрын
+Akshay Bhoite Welcome.
Sir aapne bahut hi accha samjhaya h thank you sir but sir kae kae baar bahut tej aavaj me bol dete the wo nhi accha lga
@edupoint.physics
5 жыл бұрын
Bhao socket kharab hai. Current me control nahi rahta.
Yeh app particles ka mass same leke chale ho na
nice video sir ji
👍👍👍👍
Sir aap ko to scientist hona chahiye
@edupoint.physics
5 жыл бұрын
Shubham bhai, But i am an ordinary person.
@TANUJKUMARPandey9999
5 жыл бұрын
Extraordinary but a person must be the one according to best of his abilities.In my openion Sir ko professor hi hona chahiye bcz his explanation is amazing.Indian Feynman.
Sabse Garda samjhaya hai aapne
Sir Coulomb's law main 1/r2 kyon ata hai 1/r kyon nhi ata. Please reply
Awesome
Nice
Sir charge kis pe depend krta he Or coulomb's low bhi Or coulomb's law scalar he ya vector? Btaiye sir pls
@neerajsaininj1087
5 жыл бұрын
Bhai 'r' distance pe rkhe hue point charges pe lgne wali force btata hai Coulomb's law . And force is a vector quantity
Ok
Sir please inverse square law per video banaye Coulomb's law and gravitational law dono iss per dependent h
@edupoint.physics
6 жыл бұрын
Bhai agar inverse square law ke naam pe koi video bana raha hai to wo aapko burbak bana raha hai.
@adityayanbhardwaj7131
6 жыл бұрын
EduPoint sir kaise? 😁😅
What is medium
Sir exam likhne ka tarika bhi btaye plz
Is this lecture for neet level?? Or just boards level?
@pramitmahajan5639
4 жыл бұрын
clear understanding is required for any exam, sir s lectures give perfect understanding. so you are at right place for which ever exam you are giving
Sir aap teach karte samaye itna shout kyun karte hain??
Jab apne 21 videos hi open kar rakha hai to playlist main 28 video display karne ka kya matlab hai 🤨😡
sir biology 12th video
Thanks sir
Nice sir
Thanku so much sir.