- AFerrimagnetism.
- BFerromagnetis.
- CParamagnetism.
- DDiamagnetism.
Explanation:
A superconductor exhibits perfect diamagnetism.
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In
nucleus, there are
|
(a) 138 protons and 88 neutrons |
(b) 138 neutrons and 88 protons |
|
(c) 226 protons and 88 electrons |
(d) 226 neutrons and 138 electrons |
A potential difference of 42,000 volts is used in an X-ray tube to accelerate electrons. The maximum frequency of the X–radiations produced is (1 eV = 1.6
and h = 6.63 ![]()
|
(a) |
(b) |
(c) |
(d) |
A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is
|
(a) 50 |
(b) 100 |
(c) 150 |
(d) 200 |
Two infinitely long parallel conducting plates having surface charge densities +σ and -σ respectively, are separated by a small distance. The medium between the plates is vacuum. If
is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
|
(a) 0 volts/meter |
(b) |
(c) |
(d) |
The energy of an X- ray photon of wavelength 1.65 Å is (h = 6.6
, 1eV = 1.6 ![]()
|
(a) 3.5 keV |
(b) 5.5 keV |
(c) 7.5 keV |
(d) 9.5 keV |
As our eyes can not retrace the bent path of light, a stick, dipped in water, appears: