- AParamagnetic material becomes ferromagnetic material.
- BFerromagnetic material becomes diamgnetic material.
- CFerromagnetic material becomes paramagnetic material.
- DParamagnetic material becomes diamagnetic material.
Explanation:
The Curie temperature(TC) is the temperature at which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism, that is, they go from becoming ferromagnetic to paramagnetic.
Above curie temperature, ferromagnetic material behaves as paramegnetic material.
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The current i in an induction coil varies with time t according to the graph shown

in figure. Which of the following graphs shows the induced emf (e) in the coil with time
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(a)
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(b)
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(c) |
(d)
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The Rutherford a-particle experiment shows that most of the a-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom
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(a) Atom is hollow |
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(b) The whole mass of the atom is concentrated in a small centre called nucleus |
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(c) Nucleus is positively charged |
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(d) All the above |
Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be

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(a) Maximum in situation (A) |
(b) Maximum in situation (B) |
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(c) Maximum in situation (C) |
(d) The same in all situations |
Fission of nuclei is possible because the binding energy per nucleon in them
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(a) Increases with mass number at high mass numbers |
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(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true
| (a) Q is of non-magnetic material |
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(b) Q is a bar magnet identical to P, and its north pole placed on top of P's north pole |
| (c) Q is of unmagnetized ferromagnetic material |
| (d) Nothing can be said about Q's properties |