- A[M L T-2]
- B[M0 L0 T0 A1]
- C[M L3 T0]
- D[M L2 T-3]
Explanation:
The flow of charge per unit time is defined as current. The fundamental unit of current is Ampere (named after Andre Marie Ampere).
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The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be
|
(a) 10 : 8 |
(b) 9 : 1 |
(c) 4 : 1 |
(d) 2 : 1 |
Electric current is due to drift of electrons in
| (a) Metallic conductors | (b) Semi-conductors | (c) Both (a) and (b) | (d) None of these |
If a wire of resistance R is melted and recasted to half of its length, then the new resistance of the wire will be
|
(a) R/4 |
(b) R/2 |
(c) R |
(d) 2R |
A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of
|
(a) Teak wood |
(b) Plastic material |
|
(c) Soft iron of high permeability |
(d) A metal of high conductivity |
An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be
|
(a) |
(b) |
(c) |
(d) 2eV/m |
An electric bulb is rated 60W, 220V. The resistance of its filament is
|
(a) 708 W |
(b) 870 W |
(c) 807 W |
(d) 780 W |