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. |
Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor:
(a) | increases |
(b) | decreases |
(c) | does not change |
(d) | is zero |
A capacitor of capacitance is connected across an AC source of voltage , given by;
The displacement current between the plates of the capacitor would then be given by:
1.
2.
3.
4.
(A) | a varying sinusoidal current flowing through a capacitor |
(B) | an electric dipole, whose size (and magnitude) is oscillating with time |
(C) | a steady current flowing through a toroid |
1. | only (A) |
2. | only (B) |
3. | only (A) & (B) |
4. | (A), (B), (C) |
Statement I: | Charged particles which undergo acceleration or deceleration radiate their energy away. |
Statement II: | Therefore, charged particles moving in circular paths in a uniform magnetic field should also radiate their energy. |
1. | Statement I is true, Statement II is true and Statement I implies Statement II. |
2. | Statement I is true, Statement II is true and Statement I does not imply Statement II. |
3. | Statement I is true, Statement II is false. |
4. | Statement I is false, Statement II is true. |
Out of the following options which one can be used to produce a propagating electromagnetic wave?
1. | a stationary charge. |
2. | a chargeless particle. |
3. | an accelerating charge. |
4. | a charge moving at constant velocity. |
Assume a bulb of efficiency as a point source. The peak values of the electric field and magnetic field produced by the radiation coming from a bulb at a distance of are respectively:
1. | |
2. | |
3. | |
4. |
1. | 2. | ||
3. | 4. |
1. | 2. | ||
3. | 4. |