Consider the following statements (i) For a permanent magnet the area of a hysteresis loop is allowed to be large. (ii) Coercively of the material in permanent magnets should be small. Which of the following statements is/are true?
1. (i) but not (ii) 2. (ii) but not (i) 3. Both (i) and (ii) 4. Neither (i) nor (ii)
Subtopic: Curie's Law and Hysteresis (OLD NCERT) |
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Doppler’s effect is sound in addition of relative velocity between source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
Two coherent monochromatic light beams of intensities \(I\) and \(4I\) superimpose. The maximum and minimum possible intensities in the resulting beam are:
1. \(5I\) and \(I\)
2. \(5I\) and \(3I\)
3. \(3I\) and \(I\)
4. \(9I\) and \(I\)
Subtopic: Superposition Principle |
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