Q. No.Assume a bulb of efficiency \(2.5\%\) as a point source. The peak values of the electric field and magnetic field produced by the radiation coming from a \(100~\text{W}\) bulb at a distance of \(3~\text{m}\) are respectively:
| 1. | \( 2.5 ~\text{V/m}, ~2.2 \times 10^{-8} ~\text{T} \) |
| 2. | \( 3.6 ~\text{V/m}, ~ 3.6 ~\text{T} \) |
| 3. | \( 4.07~\text{V/m},~ 1.4 \times 10^{-8} ~\text{T}\) |
| 4. | \( 4.2 ~\text{V/m}, ~3.4 \times 10^{-6}~\text{T}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \( 2.16~\text{cm}, 24.1~\text{GHz} \) | 2. | \( 0.29~\text{cm}, 13.7~\text{GHz} \) |
| 3. | \( 3.23 ~\text{cm}, 20.0~\text{GHz} \) | 4. | \( 1.26~\text{cm}, 23.9~\text{GHz}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe maximum value of the electric field in the wave is:
1. \(\dfrac {E_0} {\sqrt 2}\)
2. \(E_0\)
3. \(\sqrt 2 E_0\)
4. \(\sqrt 3 E_0\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology(\(c\) = velocity of light in vacuum)
1. \(v=\dfrac{{c}}{\sqrt{\varepsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\dfrac{\mu_{{r}}}{\varepsilon_{{r}}}}\)
4. \(v=\sqrt{\dfrac{\varepsilon_{{r}}}{\mu_{{r}}}}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(f_t=f_0\)
2. \(f_t>f_0\)
3. \(f_t<f_0\)
4. \(f_t\neq f_0\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biologypropagates along the \(x\)-axis. A second waveform given by: \(\overrightarrow E_2=E_0\hat k\sin(\omega t-kx)\)
is also allowed to propagate. The magnetic field has the amplitude: (Assume speed of light in vacuum is \(c\))
1. \(\frac{E_0}{c}\)
2. \(\frac{E_0}{2c}\)
3. \(\frac{\sqrt2E_0}{c}\)
4. zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biologywhere \(\omega\) and \(\beta\) are constants, \(t\) is the time and \(x\) represents the x-coordinate. \(c\) is the speed of the light in vacuum.
The value of \(\beta,\)
| 1. | cannot be less than 1. |
| 2. | equals 1, always. |
| 3. | cannot be greater than 1. |
| 4. | can be any non-zero value. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(\hat i\)
2. \(\hat j\)
3. \(\hat k \)
4. \(\hat j + \hat k\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(300~\text{T}\) | 2. | \(10^{-6}~\text{T}\) |
| 3. | \(9 \times 10^{10}~\text{T}\) | 4. | \(300\sqrt {2}~\text{T}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(E_0 \hat i\)
2. \(\dfrac {E_0} { \sqrt 2}\) \(\hat i \)
3. \(\sqrt 2E_0 \hat i\)
4. zero (null)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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