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Yogita Ingle 6 years, 2 months ago
A wavefront is defined as a surface of constant phase. A wavefront is the locus of all points in the medium that have the same phase.
The ray, at each point of a wavefront, is normal to the wavefront at that point. The ray indicates the direction of propagation of wave while the wavefront is the surface of constant phase.
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Electric field lines are the parth traced by unit positive charge when left free in electric field and tangent to field lines gives the direction of electric field.So if they will form close loops then the tangent at any point will direct in different directions which is not possible.Also, the unit positive charge moves only due to force of repulison and attraction and as a result traces only defintie path not circular path.
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Sia ? 6 years, 2 months ago
As we know, {tex}\Delta{/tex}L = {tex}\frac{FL}{AY}{/tex}, {tex}\frac{L_A}{L_B}{/tex} = {tex}\frac{1}{2}{/tex} and {tex}\frac{r_A}{r_B}{/tex} = {tex}\frac{1}{2}{/tex}
[{tex}\therefore{/tex} the wires {tex}A\ and\ B{/tex} are pulled by the same force and they are made up of same material, hence, {tex}F_A = F_B = F, = Y_A = Y_B = Y{/tex}]
{tex}\frac{\Delta L_A}{\Delta L_B}{/tex} = {tex}\frac{L_{A}}{\pi r_{A}^{2}} \times \frac{\pi r_{B}^{2}}{L_{B}}{/tex}
{tex}\frac{\Delta L_{A}}{\Delta L_{B}}{/tex} = {tex}\frac{L_{A}}{L_{B}} \times\left(\frac{r_{B}}{r_{A}}\right)^{2}{/tex}
{tex}\frac{\Delta L_{A}}{\Delta L_{B}}{/tex} = {tex}\frac{1}{2} \times\left(\frac{1}{2}\right)^2{/tex}= {tex}\frac{1}{2}{/tex}
{tex}\frac{\Delta L_{A}}{\Delta L_{B}}{/tex}= {tex}\frac{1}{8}{/tex}
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No, the drift speed of electrons is superposed over the random velocities of the electrons and they move in zig- zag path.
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Sia ? 6 years, 2 months ago
Polar dielectrics
A polar molecule which has permanent electric dipole moment ({tex}\vec p{/tex}) in absence of electric field are called polar dielectrics. In these substances the possibilities of centre coinciding of positive and negative charges are zero. Polar molecules are randomly oriented. e.g. Water, alcohol, HCl, NH3.
Non-polar dielectrics
A non-polar molecule having zero dipole moment in its normal state are called non-polar dielectrics. In these substances the centres of both positive as well as negative charges coincide.
Non-polar molecules have symmetrical shapes. e.g. Any non-conducting material.
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