- AAlternating current does not pass through ammeter.
- ✓Average value of current for a complete cycle is zero.
- CSome part of alternating current does not pass through ammeter.
- DNone of the above
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Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then
|
(a) 9 cm |
(b) 7 cm |
(c) 5 cm |
(d) 3 cm |
Frequency of a wave is 6
. The wave is
|
(a) Radiowave |
(b) Microwave |
(c) X-ray |
(d) None of these |
The time period of rotation of the sun is 25 days and its radius is 7
. The Doppler shift for the light of wavelength 6000 Å emitted from the surface of the sun will be
|
(a) 0.04 Å |
(b) 0.40 Å |
(c) 4.00 Å |
(d) 40.0 Å |
The electromagnetic waves of frequency 2 MHz to 30 MHz are
|
(a) In ground wave propagation |
(b) In sky wave propagation |
|
(c) In microwave propagation |
(d) In satellite communication |