- AA potentiometer.
- BA hot-wire voltmeter.
- CA moving-coil galvanometer.
- DA moving-magnet galvanometer.
Explanation:
The AC voltae across a resustance can be measured using a hot-wore volmeter.
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Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits
|
(a) 0.12 mm |
(b) 0.3 mm |
(c) 3.0 mm |
(d) 4.0 mm |
A hollow conducting sphere of radius R has a charge (+Q) on its surface. What is the electric potential within the sphere at a distance r =
from its centre
|
(a) Zero |
(b) |
(c) |
(d) |
A laser beam of pulse power 1012 watt is focussed on an object are 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is
|
(a) 1020 |
(b) 1016 |
(c) 108 |
(d) 104 |
An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index
|
(a) 0.20 |
(b) 5.0 |
(c) 0.67 |
(d) 1.5 |
Electric current is due to drift of electrons in
| (a) Metallic conductors | (b) Semi-conductors | (c) Both (a) and (b) | (d) None of these |