For substances hysteresis (B - H) curves are given as shown in figure. For making temporary magnet which of the following is best?
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe relative permeability of a ferromagnetic substance varies with temperature (T) according to the curve:
1. A
2. B
3. C
4. D
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figure illustrates how B, the flux density, inside a sample of unmagnetized ferromagnetic material varies with B0, the magnetic flux density, in which the sample is kept. For the sample to be suitable for making a permanent magnet:
1. OQ should be large and OR should be small
2. OQ and OR should both be large
3. OQ should be small and OR should be large
4. OQ and OR should both be small
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyElectromagnets are made of soft iron because soft iron has:
1. low retentivity and high coercive force
2. high retentivity and high coercive force
3. low retentivity and low coercive force
4. high retentivity and low coercive force
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAbove Curie temperature:
1. a ferromagnetic substance becomes paramagnetic.
2. a paramagnetic substance becomes diamagnetic.
3. a diamagnetic substance becomes paramagnetic.
4. a paramagnetic substance becomes ferromagnetic.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following graphs represents the correct variation of the intensity of magnetisation (I) with the intensity of the magnetising field (H) in a ferromagnetic substance?
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe magnetic susceptibility χ of a ferromagnetic material varies with temperature, as:
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA material when heated suddenly changes its magnetic property at a particular temperature and above this temperature, its susceptibility is found to be inversely proportional to the absolute temperature. The material may be:
1. Ferromagnetic
2. Diamagnetic
3. Paramagnetic
4. Ferromagnetic or Paramagnetic
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA long solenoid has 1500 turns per metre and an iron core of = 1100 is kept inside it. 2A current flows in the coil of the solenoid. If the core is heated beyond curie temperature, then:
1. | The H and B fields in the solenoid reduce to zero. |
2. | The H and B fields in the solenoid remain unchanged. |
3. | The H field in the solenoid is nearly unchanged but B field decreases significantly. |
4. | The B field in the solenoid is nearly unchanged but the H field decreases significantly. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology