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Hindi
8.Electromagnetic waves
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એક બિંદુવત ઉદગમસ્થાનમાંથી વિદ્યુતચુંબકીય તરંગો ઉત્સર્જાય છે. આ ઉદTગમસ્થાનનો આઉટપુટ પાવર $1500\, W$  છે, તો આ ઉદગમથી $3m$ દૂર આવેલા બિંદુએ વિદ્યુતક્ષેત્રનું મહત્તમ મૂલ્ય ........ $V \,M^{-1}$  હશે.

A

$500$

B

$100$

C

$500/3$

D

$250/3$

Solution

તીવ્રતા $\,\,{\text{I}}\,\, = \,\,{\text{c}}\,\,{\varepsilon _0}{E_{r.m.s}}^2\,\, = \,\,\frac{P}{A}\,\,\,\therefore \,\,{E_{r.m.s}}^2\,\, – \,\,\frac{P}{{c{\varepsilon _0}\,\, \times \,\,4\pi {r^2}}}\,\,\therefore \,\,{E_0}\,\, = \,\,\left( {\frac{{2P}}{{c{\varepsilon _0}\,\, \times \,\,4\pi {r^2}}}} \right)$

$ = \,\,{\left[ {\frac{{2\,\, \times \,\,1500}}{{3\,\, \times \,\,{{10}^8}\,\, \times \,\,8.85\,\, \times \,\,{{10}^{ – 12}}\,\, \times \,\,4\,\, \times \,\,3.14\,\, \times \,\,{{\left( 3 \right)}^2}}}} \right]^{\frac{1}{2}}}\,\, = \,\,100\,\,V\,\,{m^{ – 1}}$

Standard 12
Physics

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