Explanation:
When the battery is discharging, the terminals voltage of the battery is always $≤$ Emf of cell $[∵\text{r}>0]$
$\therefore$ There will always be a difference which is defined to be lost volt.
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The focal length of the objective of a compound microscope if fo and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument:
In a charged capacitor, the energy resides
|
(a) The positive charges |
(b) Both the positive and negative charges |
|
(c) The field between the plates |
(d) Around the edge of the capacitor plates |
The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be
|
(a) 5 μF |
(b) 10 μF |
(c) 20 μF |
(d) 40 μF |
A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes
|
(a) |
(b) |
(c) |
(d) nR |
Four capacitors are connected as shown in the figure. Their capacities are indicated in the figure. The effective capacitance between points x and y is (in μF)
|
(a) |
(b) |
(c) |
(d) 2 |
Angle of dip is 90o at
|
(a) Poles |
(b) Equator |
(c) Both (a) and (b) |
(d) None of these |
For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere
|
(a) ~ 1.2 × 1012 m–3 |
(b) ~ 106 m–3 |
(c) ~ 1014 m–3 |
(d) ~ 1022 m–3 |
