1 2 points details my notes sercp11 153p025 ask your teacher...

1. [-/2 Points] DETAILS MY NOTES SERCP11 15.3.P.025. ASK YOUR TEACHER PRACTICE ANOTHER Four point charges are located at the corners of a square. Each charge has magnitude 1.90 nC and the square has sides of length 3.60 cm. Find the magnitude of the electric field (in N/C) at the center of the square if all of the charges are positive and three of the charges are positive and one is negative. HINT (a) all the charges are positive N/C (b) three of the charges are positive and one is negative N/C Need Help? Read It Watch It SUBMIT ANSWER

Transcript

00:01 We are given a square, square basically, and there are charges here 3 .2 nanofulm and here also, here also and here also.

00:21 All the charges are plus 3 .2 nanoculum plus 3 .2 nanoculum.

00:28 Plus 3 .2 nanoculum.

00:31 Now we have a point here at the center.

00:34 This will exert a force in this direction and this charge will exert a force in this direction which will definitely these forces will balance each other why because the charges are equal and the distance of the charge distance of the point from the charge is also same so whatever this force which is exerted by this would be equal to the force exerted by this charge in this direction similarly this charge will exert a force which is in this direction and this charge will exert a force in this direction.

01:05 These are diagonals, basically.

01:06 The forces will balance out and for the part a, the net force will come out to be zero.

01:13 Now, what happens if the one of the charge becomes negative? for example, let us take the next case.

01:23 So now i'm drawing these diagonals.

01:28 Let's suppose here minus 3 .2 nanoculum is there.

01:32 And here plus 3 .2 nanogulum is there.

01:33 And here, plus 3 .2 is there here also plus 3 .2 nanoculum here also plus 3 .2 nanoculum now this positive charge and this positive charge will cancel the force here because this charge will exert a force in this direction and this charge will exert a force in this direction equal and opposite forces will balance out and this positive charge will exert a force in this direction and definitely this negative charge will also exert a force in this direction.

02:05 It will attract a unit positive charge.

02:08 So like that here the force in this direction would be equal to twice of f because both the forces are equal.

02:14 If this is exerting a force f and this is also this will also attract with the force f.

02:21 So that's the reason along this diagonal we are going to get the force 2f.

02:26 So fnet is equal to 2f...

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