Class 12 Physics Chapter 1 in Assamese | Electric Charges and Fields | Let's Approach | Part 04

Añadido: 2026-05-08

[00:00:41]Good evening and everyone welcome and welcome back to Good evening. Uh good evening is and everyone welcome and welcome back to Let's Approach.

[00:00:58]Shandi, Sunal, Dunu, Aran, Dishan. Good evening. Good evening and everyone.

[00:01:04]Welcome and welcome.

[00:01:08]Good evening. Good evening. Good evening. Audio.

[00:01:11]Audio.

[00:01:15]Class 12 physics.

[00:01:26]You can say that principle of superposition.

[00:01:45]as a demo.

[00:01:48]Full 2026 Max.

[00:02:58]result is very good. Yes. Yes sir. Yes sir. Happy happy cookie.

[00:03:06]Everything.

[00:03:36]65 plus letter marks 70% 70% 30% performance to 70%.

[00:04:22]Top After 30% class 12.

[00:05:47]Okay.

[00:05:49]for 12.

[00:06:11]Class 11 physics recording. Class 12.

[00:06:15]Class 12.

[00:06:29]Enough. Enough.

[00:06:40]Fore 96 97 Okay.

[00:07:17]Superosition principle of superposition.

[00:07:36]Yes or no? Yes.

[00:07:47]Okay.

[00:07:54]plus.

[00:07:59]Okay.

[00:08:03]Okay.

[00:08:15]system.

[00:08:23]Q1 plus Q1.

[00:08:33]Okay.

[00:08:39]system.

[00:08:41]Q1.

[00:08:57]Obviously.

[00:09:12]Yes. Obviously.

[00:09:20]Q1 force Q.

[00:10:01]We are working on it.

[00:10:15]Yes. Good. Good.

[00:10:24]You can more precise. F1 Q1 R Q1 Q system. Let's suppose Suppose Q2 R2 R2 distance Q2 Obvious respect system. System R1 Q2 system.

[00:13:02]Q4 Evently Q1 Q2 Q3 dot dot dot Q1 QE Q got Q expense total force Principle of superposition.

[00:14:04]QT distance. Let's suppose Yes or no? Yes.

[00:14:43]Q4 Q4, Q5, Q6 Q distance RN Q.

[00:15:21]Okay.

[00:15:46]Q1 to Q2 Q3 Q4 expense. Sorry.

[00:16:36]Q1 F1 Q2 of According to Principle of Q vector F1 vector vector f_sub_2 vector f2 vector vector vector vector dot dot dot dot fn total force is equal to f_sub_1 vector plus f_sub_2 vector plus f_sub_2 vector vector plus dot dot vector force vector vector vector vector.

[00:17:55]Any doubt? Any doubt? Principle of superposition of superosition 100% [clears throat] students feedback 100% 11.

[00:18:52]Okay.

[00:18:54]No doubt.

[00:19:03]Okay. Okay.

[00:19:21]It states that It states that in the presence of a number of in the presence of a in the presence of a number of surges.

[00:19:56]Number of sizes in a system in a system, comma, the force on a given the force on a given S is the I must figure out S like is The vector sum of the vector sum of the vector sum of the vector sum of vector sum of all the forces all the forces all the forces on their s on On death on death due to all due to all surrounding ses due to all surrounding ses of superposition statement.

[00:21:20]>> [snorts] >> It states that in in the presector vector sum Vector is a vector sum of the all the forces on the S due to the allce vector vector F1 vector plus F_sub_2 vector plus F vector FM.

[00:22:30]Any doubt?

[00:22:33]Any doubt?

[00:23:01]50.

[00:23:11]Palooa all clear.

[00:23:17]Let us consider.

[00:23:22]Let us consider.

[00:23:27]Let us consider n point ses. n point ses.

[00:23:42]Q1 comma Q2 comma QT dot dot dot dot QN surrounding surrounding surrounding a given sounding a point source surrounding a point source Q in space.

[00:24:17]If f_sub_1 vector comma f_sub_2 vector comma f_sub_3 vector dot dot dot dot comma fn vector denote the denote the denote the denote Individual forces.

[00:24:55]Individual forces exerted on Q exerted on Q by this sizes by these sizes respectively.

[00:25:25]Then then according to the principle of superposition according to the principle of principle of superposition.

[00:25:54]Principle of superposition.

[00:25:57]The total force on the commodity. The total force on the total force on the given sq given sq is given by is given by f vector is equal to f_sub_1 vector plus f_sub_2 vector plus f_sub_t vector plus dot dot f4 vector f plus dot dot dot dot fn vector let us consider end points q1 q2 dot dot qn1 q2 Q2 QN surrounding a point Q in space Q1 Q2 QT Q given point Q in space if F_sub_1 vector F_sub_2 vector F2 vector do FN vector FN forces exerted on Q by respectively Fore vector vector F vector dot dot dot dot dot. F and vector denote the denote the individual forces exerted on Q by the S respectively. Then according to the principle of superposition, according to the principle of superosition, the force on the given is given by vector vector vector fce.

[00:28:17]Any doubt?

[00:28:24]Any doubt?

[00:28:26]Any doubt?

[00:28:37]Any doubt?

[00:29:08]Let us consider end point Q2 if vector f_sub_2 vector beta exp1 vector vectoral vector Q1 4 epsilon Q1 Q1 Q1 Q1 Q Q1 Q1 by you can say that Q1 Q / distance Q1 Q1 Q1 divided by distance to R1 Left hand Right hand.

[00:30:45]Vectority is equal to vector vector Q1 Qantity to vector vector vector Q1 vector pointing towards Q vector Q pointing toward Q1 factor F2 vector vector F_sub_2 vector 1 by 4 epsylon F_sub_2 F_sub_2 vector Q2 force Q2 into Q2 into Q2 into Q divided by distance vector F vector 1 by 4 pi epsylon QT into Q / RT² into RT= 1 by 4 pi epsylon Q into Q / Rn² square into RN f_sub_1 vector yellow f_sub_2 vector yellow f_sub_2 vector yellow dot dot vector yellow topology geology Then compound it.

[00:34:25]Po. Good evening, sir.

[00:34:43]If the distance between if the if the distance between if the distance between the surges between the surges Q1 and Q is denoted by R1 is denoted by R1 and R1 cap is the R1 cap is the unit vector form.

[00:35:35]unit vector from Q1 to Q1 to Q. Then so if the distance between the sizes Q1 and Q is denoted by R1 and R1 cap is the unit vector from Q1 to Q. Then Q1 R1 You can write F_sub_1 vector is equal to 1 by 4 pi epsylon Q1 into Q / R1² into R1.

[00:36:27]If the distance between the Q1 and Q1 expon Q1 into Q / R1² into R1 S.

[00:36:58]Okay.

[00:37:01]Similarly, similarly you can say that Q2 Expressim.

[00:37:48]Simple. Once more vector similarly similarly similarly f_sub_2 vector is equal to 1 by 4 pi epsilon q2 into q / r2² into problem vector ft vector is = 1 by 4 pi epsylon qt into q / rt² into RN vector vectoral 1 vector unit.

[00:39:05]Okay.

[00:39:09]distance r² into rn f_sub_1 vector f_sub_2 vector f_sub_2 vector from equation one.

[00:39:35]from equation one.

[00:39:43]Question f_sub_1 vector is equal to sorry f vectoral f_sub_1 vector f_sub_1 vector 1 by 4 pi epsylon q1 into q / r1² into r1 plus f_sub_2 vector f2 vector 1 by 4 pi epsylon q2 into q / r2² into r2k vector 1x 4 pi epsylon qt into q / rt rt² into rtcap dot dot dot dot continue last 1 by 4x epsilon qn into q / rn² into rn Thank you for only 1x4.

[00:41:02]epilon 1x 42 / 4 / 4 / Oil not common law.

[00:41:34]This implies falon Q1 R1² R1² R1 Q2 R2² R2 Q / RT² RT last 1 QN / RN².

[00:42:51]But but for Express.

[00:43:24]statistics x1 x1² + x2 + x3 x3 square + x1² x2² x3² I can say I running from one to mathematics.

[00:45:06]X1 X2 X3 dot dot dot X1 X2 X dot dot X you can write X I I running from 1 to N.

[00:45:50]Fore!

[00:45:53]Foreign! Foreign!

[00:46:14]With the help of summation this implies f vector q / 4 pi epsylon summation.

[00:46:45]Okay.

[00:46:52]Q21 Q2 Q3 Q1 R1² R2 square RT² dot dot dot dot dot dot R square R1 cap R2 cap Rap Q1 Q2 R1 R2 R square I R1, R2, Rap, I starting I value I totition.

[00:48:12]Total force.

[00:48:14]Any doubt?

[00:48:49]Class 12.

[00:49:18]Okay.

[00:49:21]This principle, this principle, this principle is used to obtain is used to is used to obtain the net force.

[00:49:44]The net force comma net electric field.

[00:49:54]You can say that net electric field net flux etc due to etc. due to superposition of ses due to superposition of Superosition oftition.

[00:50:50]electric field. Electricosposition of discuss.

[00:51:31]Any doubt? Any doubt? Any doubt? Till this point? Any doubt?

[00:51:37]Any doubt?

[00:51:41]If you miss the train statist all videos, no doubt. Okay.

[00:52:19]No doubt. Okay.

[00:52:23]Unit of important.

[00:52:53]SI unit of SI unit of unit of S is SI unit of S is kum.

[00:53:14]Yes. Yes.

[00:53:20]Next one.

[00:53:28]1 in SI system.

[00:53:35]In SI system the electrostatic force is given by the electrostatics.

[00:53:45]The electrostatic force is given by force is given by the electrostatic force is given by where the two sizes are in vacuum or There are two sides are in vacuum.

[00:54:27]Yeah.

[00:54:31]F is equal to 1 by 4 pi epsylon K q1 q2 magnit Q1 Q2 Q1 Q2 / SI system I think Definition of 1 kum. The definition of one Q121 Q21 Q1 Q2 m 1 distance.

[00:56:26]That means that means if Q1 Q2= Q12 Then then expon 1 1 / 1 1 1 f= 1 1x 9 into 10 9 into 10 9 9 into 10 9 Attel into Force into 10.

[00:59:37]1.

[00:59:39]Go for if we take If we take Q1 is = Q2 is equal Then the above.

[01:00:21]Then then the above formula becomes then the above above formula becomes then the above formula becomes f is equal to 1x 4 pi F I don't know Q1 value 1 Q2 value 1 divided by distance 1 this implies F= 1 by 4 epsylon you can say that 9 into 10 9 into 10 therefore therefore 1um 1 column.

[01:01:20]1 column is the amount of S is the amount of amount of S is the amount of S that repels or attack that repels that repels or attract X that you can so attack N equal and similar and similar S opposite opposite.

[01:02:19]S we have force of we have force of 9 into 10 ^ 9 Newton when placed in when placed in veum at a distance of 1 m apart. at a distance of 1 m apart.

[01:03:03]Important one is the amount of that repels that repels.

[01:03:19]for similar We have force.

[01:04:11]Okay.

[01:04:17]Next to CGS unit the CGS unit.

[01:04:24]The CGS unit of the CGS unit of S is the unit of S Keep the CGS unit of S is key. ESU. Yes. The CGS unit of S is electrostatic.

[01:05:00]Electrostatic unit of S.

[01:05:04]Electrotoatic unit of shortcut S.

[01:05:20]CSU.

[01:05:32]Yes.

[01:05:36]You can say it is known as it is known as column.

[01:05:55]Okay.

[01:05:56]So 1 kum is equal to 1 kum is equal to 3 into 10 9 unit of S is another unit of S is electromagnetic unit.

[01:06:44]Electro magnetic unit of S EM 1 EMU of S 1 EMU of S is equal to 3 into 10^ 10.

[01:07:23]So t into 10 power 1 kum is equal to 10^ 10 into 10 ^ 10 es of Plus value 10.

[01:08:21]Statistic memo.

[01:08:43]Any doubt?

[01:08:48]Okay, next Miles to go.

[01:09:43]Physics chemistry physics, chemistry, mathematics, biology, English physics recording.

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[01:12:51]Okay.

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[01:13:21]This is our result.

[01:13:32]96 95 96 more than 65 91 91 96 93 91 88 Physics 91 89 86 Physics 87 [snorts] 85 Physics 84. Physics 85. Physics 87. 81.

[01:14:28]87. Physics 96.

[01:14:32]Physics 96.

[01:14:39]I think 96. Physics 96.

[01:14:53]93, Physics 80, Physics are 91, Physics 87, Physics 92, Physics 95, Student, Physics 91, Physics 88, Physics of 90, Physics, Physics 91, Physics of 91, Physics 91, Physics 84, Physics of 92, 19 91 92 93 94 physics 85 85 88 physics 91 91 physics 89 biology 96 Okay next next physics physics 84 physics physics 84 physics 80 physics 82 physics 84 physics 86 6 84 by 82 physics 84 87 88 physics 83 Okay 80 82 84 90 physics 84 physics 81 90 91 84 91 Thank you.