- AThermal energy
- BKinetic energy
- CPotential energy
- DSolar energy
Explanation:
The work done against electrostatic force gets stored in the form of potential energy.
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The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively
and
. If the air is replaced by glass (dielectric constant = 5) between the plates, the capacity of the plates and the energy stored in it will respectively be
|
(a) |
(b) |
(c) |
(d) |
Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
|
(a) Einstein mass - energy relation |
(b) Einstein theory of relativity |
|
(c) Photoelectric effect |
(d) None of these |
The magnetic field at a distance r from a long wire carrying current i is 0.4 Tesla. The magnetic field at a distance 2r is
|
(a) 0.2 Tesla |
(b) 0.8 Tesla |
(c) 0.1 Tesla |
(d) 1.6 Tesla |
Potassium has a bcc structure with nearest neighbour distance 4.525 Å. Its molecular weight is 39. Its density in kg/m3 is
|
(a) 900 |
(b) 494 |
(c) 602 |
(d) 802 |