- Home
- Standard 12
- Physics
8.Electromagnetic waves
medium
મુક્ત અવકાશમાં ઇવિદ્યુતચુંબકીય તરંગમાં વિદ્યુતક્ષેત્રનું $r.m.s.$ મૂલ્ય $E_{rms} = 6\, V m^{-1}$ છે. ચુંબકીય ક્ષેત્રનું મહત્તમ મૂલ્ય કેટલું થાય?
A
$2.83 \times 10^{-9}\;T$
B
$4.83 \times 10^{-8}\;T$
C
$8.83 \times 10^{-8}\;T$
D
$2.83 \times 10^{-8}\;T$
(NEET-2017)
Solution
$\text { Given: } E_{\mathrm{rms}}=6 \,\mathrm{Vm}^{-1}$
$\frac{E_{\mathrm{rms}}}{B_{\mathrm{rms}}}=c$ or $B_{\mathrm{rms}}=\frac{E_{\mathrm{rms}}}{c}$
$B_{\mathrm{rms}}=\frac{6}{3 \times 10^{8}}=2 \times 10^{-8}\, \mathrm{T}$
since, $B_{\mathrm{rms}}=\frac{B_{0}}{\sqrt{2}}$
where $B_{0}$ is the peak value of magnetic field
$\therefore B_{0} =B_{\mathrm{rms}} \sqrt{2}=2 \times 10^{-8} \times \sqrt{2} T $
$ B_{0} \approx 2.83 \times 10^{-8}\, \mathrm{T}$
Standard 12
Physics
