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Q. No.The electric field intensity produced by the radiations coming from \(100 ~\text{W}\) bulb at a \(3~\text{m}\) distance is \(E\). The electric field intensity produced by the radiations coming from \(50 ~\text{W}\) bulb at the same distance is:
1. \(\frac{E}{2}\)
2. \(2 E\)
3. \(\frac{E}{\sqrt{2}}\)
4. \(\sqrt{2} E\)
1. \(\frac{E}{2}\)
2. \(2 E\)
3. \(\frac{E}{\sqrt{2}}\)
4. \(\sqrt{2} E\)
Subtopic: Generation of EM Waves |
From NCERT
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An EM wave radiates outwards from a dipole antenna, with \(E_0\) as the amplitude of its electric field vector. The electric field \(E_0\) which transports significant energy from the source falls off as:
1. \( \frac{1}{r^3} \)
2. \(\frac{1}{r^2} \)
3. \(\frac{1}{r}\)
4. remains constant.
1. \( \frac{1}{r^3} \)
2. \(\frac{1}{r^2} \)
3. \(\frac{1}{r}\)
4. remains constant.
Subtopic: Generation of EM Waves |
From NCERT
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A charged particle oscillates about its mean equilibrium position with a frequency of \(10^9~\text{Hz}\). The electromagnetic waves produced:
a. will have frequency of \(10^9 ~\text{Hz} .\)
b. will have frequency of \(2 × 10^9~\text{Hz}.\)
c. will have a wavelength of \(0.3~\text{m}\).
d. fall in the region of radiowaves.
Choose the correct option:
1. (a), (d)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
a. will have frequency of \(10^9 ~\text{Hz} .\)
b. will have frequency of \(2 × 10^9~\text{Hz}.\)
c. will have a wavelength of \(0.3~\text{m}\).
d. fall in the region of radiowaves.
Choose the correct option:
1. (a), (d)
2. (a), (c), (d)
3. (b), (d)
4. (c), (d)
Subtopic: Generation of EM Waves |
85%
From NCERT
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The source of electromagnetic waves can be a charge
a. moving with a constant velocity.
b. moving in a circular orbit.
c. at rest.
d. falling in an electric field
Choose the correct option:
1. (a), (d)
2. (a), (b), (c)
3. (b), (d)
4. (c), (d)
a. moving with a constant velocity.
b. moving in a circular orbit.
c. at rest.
d. falling in an electric field
Choose the correct option:
1. (a), (d)
2. (a), (b), (c)
3. (b), (d)
4. (c), (d)
Subtopic: Generation of EM Waves |
From NCERT
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