A charge Q is divided into two parts of q and Q-q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of should be
1. 2 2. 1/2 3. 4 4. 1/4
Subtopic: Coulomb's Law |
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A rectangle vessel when full of water, takes 10 mint to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water?
1. 9 min 2. 7 min 3. 5 min 4. 3 min
Subtopic: Bernoulli's Theorem |
55%
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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