- ADiamagnetic substances.
- BParamagnetic substance.
- CFerromagnetic substances.
- DWood.
Explanation:
Ferromagnetic substance, Because they get magnetize in external magnetic field and don't lose their magnetic property.
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Two plates are 2 cm apart, a potential difference of 10 volt is applied between them, the electric field between the plates is
|
(a) 20 N/C |
(b) 500 N/C |
(c) 5 N/C |
(d) 250 N/C |
A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by
|
(a) 2.0 ohm |
(b) 0.25 ohm |
(c) 1.0 ohm |
(d) 0.5 ohm |
Three identical capacitors are given a charge Q each and they are then allowed to discharge through resistance R1, R2 and R3. Their charges, as a function of time shown in the graph below. The smallest of the three resistance is
|
(a) R3 |
(b) R2 |
(c) R1 |
(d) Cannot be predicted |
A thermocouple of resistance 1.6Ω is connected in series with a galvanometer of 8Ω resistance. The thermocouple develops and e.m.f. of 10 μV per degree temperature difference between two junctions. When one junction is kept at 0℃ and the other in a molten metal, the galvanometer reads 8 millivolt. The temperature of molten metal, when e.m.f. varies linearly with temperature difference, will be
|
(a) 960℃ |
(b) 1050℃ |
(c) 1275℃ |
(d) 1545℃ |