Q. No.A magnetic field can be produced by:
1. a moving charge
2. a changing electric field
3. none of them
4. both of them
A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:
| 1. | does not deflect. |
| 2. | deflects for a very short time and then comes back to the original position. |
| 3. | deflects and remains deflected as long as the battery is connected. |
| 4. | deflects and gradually comes to the original position in a time which is large compared to the time constant. |
Electromagnetic waves are produced by:
1. a static charge
2. a moving charge
3. an accelerating charge
4. chargeless particles
An electromagnetic wave going through vacuum is described by;
\(E=E_0 \sin (k x-\omega t) ; B=B_0 \sin (k x-\omega t).\)
Then:
1. \( E_0 k=B_0 \omega \)
2. \( E_0 B_0=\omega k \)
3. \( E_0 \omega=B_0 k\)
4. none of these
An electric field \(\vec E\) and a magnetic field \(\vec B\) exist in a region. The fields are not perpendicular to each other.
| 1. | This is not possible. |
| 2. | No electromagnetic wave is passing through the region. |
| 3. | An electromagnetic wave may be passing through the region. |
| 4. | An electromagnetic wave is certainly passing through the region. |
Consider the following two statements regarding a linearly polarized, plane electromagnetic wave:
| Statement I: | The electric field and the magnetic field have equal average values. |
| Statement II: | The electric energy and the magnetic energy have equal average values. |
| 1. | Both Statement I and Statement II are True. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Statement II is False but Statement I is True. |
| 4. | Both Statement I and Statement II are Fale. |
A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving:
| 1. | along the electric field |
| 2. | along the magnetic field |
| 3. | along the direction of propagation of the wave |
| 4. | in a plane containing the magnetic field and the direction of propagation |
A plane electromagnetic wave is incident on a material surface. The wave delivers momentum \(p\) and energy \(E.\) Then:
| 1. | \(p=0, E \neq0\) |
| 2. | \(p\neq0, E=0\) |
| 3. | \(p\neq0, E \neq0\) |
| 4. | \(p=0, E=0\) |
An electromagnetic wave going through vacuum is described by
E = E0 sin(kx – ωt)
Which of the following is/are independent of the wavelength?
(a) k
(b) ω
(c) k/ω
(d) kω
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c) only
4. (a), (d)
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