1. | \(E_0k = B_0 \omega\) |
2. | If the electric field is in the \(z\text-\)direction then the magnetic field should be in the \(-y\text-\)direction |
3. | Both 1 and 2 are correct |
4. | Only 1 is correct |
1. | \(20\) m | 2. | \(30\) m |
3. | \(40\) m | 4. | \(10\) m |
Which of the following electromagnetic waves has minimum frequency?
1. Radio waves
2. Infrared waves
3. Microwaves
4. X-rays
1. | \(1.873 \times 10^7~\text{V/s} \) |
2. | \(1.873 \times 10^8~\text{V/s}\) |
3. | \(1.873 \times 10^9~\text{V/s}\) |
4. | \(1.873 \times 10^{10}~\text{V/s}\) |
A lamp emits monochromatic green light uniformly in all directions. The lamp is \(3\%\) efficient in converting electrical power to electromagnetic waves and consumes \(100\) W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of \(5\) m from the lamp will be:
1. \(1.34\) V/m
2. \(2.68\) V/m
3. \(4.02\) V/m
4. \(5.36\) V/m
A variable frequency AC source is connected to a capacitor. Then on increasing the frequency:
1. | Both conduction current and displacement current will increase |
2. | Both conduction current and displacement current will decrease |
3. | Conduction current will increase and displacement current will decrease |
4. | Conduction current will decrease and displacement current will increase |
Instantaneous displacement current of \(2.0\) A is set up in the space between two parallel plates of \(1~\mu \text{F}\) capacitor. The rate of change in potential difference across the capacitor is:
1. \(3\times 10^{6}~\text{V/s}\)
2. \(4\times 10^{6}~\text{V/s}\)
3. \(2\times 10^{6}~\text{V/s}\)
4. None of these
Which statement is incorrect?
1. | Speed of light in free space \(=\frac{1}{\sqrt{\mu_0 \epsilon_0}}\) |
2. | Speed of light in the medium \(=\frac{1}{\sqrt{\mu \epsilon}}\) |
3. | \(\frac{E_0}{B_0}=c\) |
4. | \(\frac{B_0}{E_0}=c\) |
1. | \(2\) A | 2. | \(3\) A |
3. | \(6\) A | 4. | \(9\) A |
Assertion (A): | Light can travel in vacuum but sound cannot do so. |
Reason (R): | Light is an electromagnetic wave and sound is a mechanical wave. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |