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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In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å
| (a) 10 kV | (b) 20 kV | (c) 30 kV | (d) 40 kV |
A proton accelerated by a potential difference 500 KV moves though a transverse magnetic field of 0.51T as shown in figure. The angle θ through which the proton deviates from the initial direction of its motion is
|
(a) 15° |
(b) 30° |
(c) 45° |
(d) 60° |
In a Young's double slit experiment the source S and the two slits A and B are vertical with slit A above slit B. The fringes are observed on a vertical screen K. The optical path length from S to B is increased very slightly (by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed, as a result the fringe system on K moves
|
(a) Vertically downwards slightly |
(b) Vertically upwards slightly |
|
(c) Horizontally, slightly to the left |
(d) Horizontally, slightly to the right |
Light wave is travelling along y-direction. If the corresponding 
vector at any time is along the x-axis, the direction of 
vector at that time is along
|
(a) y-axis |
(b) x-axis |
(c) + z-axis |
(d) – z axis |
Two wires of resistance R1 and R2 have temperature coefficient of resistance 
and 
, respectively. These are joined in series. The effective temperature coefficient of resistance is
|
(a) |
(b) |
(c) |
(d) |
Blue colour of sky is due to:
A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in;
