If the electric field at a certain point is zero, does the electric potential at

Question

If the electric field at a certain point is zero, does the electric potential at the point have to be zero? Marks 5 The LASER used to read compact disc (CD) has a wavelength of 780nm, while the LASER used to read a DVD has a wavelength of 560nm. How does this make it possible for a DVD to hold more information than a CD? Marks 5 Can sound waves undergo diffraction around an edge? Explain it. Marks 5 Soapy water is colorless, but when blown into bubbles it shows vibrant color. How does the thickness of the bubble walls determine the particular colors that appear ? Marks 5

Explanation / Answer

Q1. no. it is easy to see that the mid point of two point-charge which are equal in magnitude have the electric field of zero but not the electric potential. Q2. Because the wave length of the laser of the DVD reader is smaller than the one of CD so there will be more information stored. ( we can see that in the DVD case. i is smaller than in the CD) Q3. yes. it is similar to other wave . water wave, light wave. Q4. we have equation. path difference = 2*d*n where d be the thickness of the bubble wall. so difference d cause difference path. then difference wave length can go back to our eyes from the white-light.

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