- AA static charge.
- BA moving charge.
- CAn accelerating charge.
- DChargeless particles.
Explanation:
A static charge produces an electrostatic field. A moving charge produces a magnetic field. Electromagnetic waves are produced by an accelerating charge.
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The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that
|
(a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively |
|
(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity |
|
(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped |
|
(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively |
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 |
The resistivity of a potentiometer wire is 40 and its area of cross-section is 8
. If 0.2 amp current is flowing through the wire, the potential gradient will be
|
(a) |
(b) |
(c) 3.2 |
(d) 1 volt/m |
In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light
|
(a) 5000 Å |
(b) 6000 Å |
(c) 7000 Å |
(d) 9000 Å |
In a transistor circuit shown here the base current is 35 mA. The value of the resistor Rb is
| (a) 123.5 kW | (b) 257 kW | (c) 380.05 kW | (d) None of these |