Solution:
As we apply electric field is applied across a semiconductor, the electrons in the conduction band acquire energy and get accelerated. They travel from lower energy level to higher energy level. While the holes in valence band travel from higher energy level to lower energy level, where they will be having more energy.
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A particle of charge +q and mass m moving under the influence of a uniform electric field 
and a uniform magnetic field 
follows trajectory from P to Q as shown in figure. The velocities at P and Q are v
and -2v
respectively. Which of the following statement(s) is/are correct
|
(a) E = |
|
(b) Rate of work done by electric field at P is |
|
(c) Rate of work done by both the fields at Q is zero |
|
(d) a, b, c |
The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
The magnetic induction in air at a point 1cm away from a long wire that carries a current of 1A, will be
|
(a) |
(b) 2 |
(c) 3 |
(d) 4 |
A particle has a mass 400 times than that of the electron and charge is double than that of a electron. It is accelerated by 5V of potential difference. Initially the particle was at rest, then its final kinetic energy will be
|
(a) 5 eV |
(b) 10 eV |
(c) 100 eV |
(d) 2000 eV |
