Explanation:
Holes from p-type diffuse into the n-type and electrons from n-type diffuse into the p-type due to concentration gradient to form a depletion region which results in the rise of diffusion current flowing from p to n side.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The clear sky appears blue because:
Mark the correct options:
A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance
|
(a) R |
(b) |
(c) |
(d) |
A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vP and vQ respectively, then
|
(a) vP = vQ |
(b) vP = |
(c) vP = |
(d) vP = 2 vQ |
The thermo e.m.f. of a thermo-couple is 25μV/℃ at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 
, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is
|
(a) 20 ℃ |
(b) 16 ℃ |
(c) 12 ℃ |
(d) 8℃ |
The ratio activity of an element becomes 1/64th of its original value in 60 sec. Then the half life period is
|
(a) 5 sec |
(b) 10 sec |
(c) 20 sec |
(d) 30 sec |
A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be
|
(a) A straight line |
(b) A circle |
|
(c) A helix with uniform pitch |
(d) A helix with non-uniform pitch |
