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Nishan

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  1. Question: edit: why cant I post image larger than 124 mb ? And also it is not letting me exceed the image size of 124 mb including the size of the photo in reply also? I am not able to post questions because of that? Moderator please help. question need to be extendend below. Here polarization is defined as the sum of the vector of dipole moment per unit volume if that is the case shouldnt the opposite vector cancels out leaving the possibility of q'l / v in the formula? Formula is in the next picture in the reply.
  2. Yes thats great man thank you
  3. I thought I replied but forgot to press post reply. Sorry for that.
  4. Why component od E perpendicular to r is: Etheta= 1/r*dv/dtheta
  5. ok thank you for it.I was overthinking about it . Can I simply viualise it as in the figure
  6. But isn't that : when, A1i - A2i = 0 B = 90o how could we get there for other real values of B
  7. I want to understand math . I have posted a picture of math in book " A textbook of Physics" above . I want to know especially x= A1(coswt + i sinwt ) + A2 ( coswt - i sinwt ) = (A1 + A2 ) coswt + ( A1i - A2i ) sinwt = A3 coswt + A4 sinwt here we supposed an imaginary number to be A4 Again A3 = a sin B A4 = a cosB It shows that either cos B or A4 is imaginary .... Is'nt it? then we do x = asin B cos wt + a sin wt cos B when cos B = imaginary then B is imaginary so is sin B then finally finding solution we do x = a sin ( wt + B ) which I thought should have b
  8. I know that . I think you are not getting my question . I want to understand math . I have posted a picture of math in book " A textbook of Physics" above . I want to know especially x= A1(coswt + i sinwt ) + A2 ( coswt - i sinwt ) = (A1 + A2 ) coswt + ( A1i - A2i ) sinwt = A3 coswt + A4 sinwt here we supposed an imaginary number to be A4 Again A3 = a sin B A4 = a cosB It shows that either cos B or A4 is imaginary .... Is'nt it? then we do x = asin B cos wt + a sin wt cos B when cos B = imaginary then B is imaginary so is sin B then finally finding solution we do
  9. well I meant what is happening when the imaginary part of the equation of equation turns into real part of the equation in 2,3 and 4 . And why can we add two different solution of x and combine it to make one in eq(2)
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