- AOnly point charge.
- BFor both point charge and distributed charge.
- COnly distributed charges.
- DNeither distributed nor point charge.
Explanation:
Coulomb’s Law explains the force between two point charges only. A distributed charge can be considered as the sum of infinite point charges and thus the force between two distributed charge systems can be explained.
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When cathode rays strike a metal target of high melting point with very high velocity, then
| (a) X-rays are produced | (b) Ealpha-rays are produced |
| (c) TV waves are produced |
(d) Ultrasonic waves are produced |
An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends:
A bar magnet is oscillating in the earth's magnetic field with time period T. If its mass is increased four times then its time period will be
|
(a) 4 T |
(b) 2T |
(c) T |
(d) T/2 |
X-rays cannot be deflected by means of an ordinary grating due to
|
(a) Large wavelength |
(b) High speed |
(c) Short wavelength |
(d) None of these |
The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be
|
(a) 18 |
(b) 32 |
(c) 64 |
(d) 20 |