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Which of the following statement is false? (JSTSE, 2014)

Which of the following statement is false? (JSTSE, 2014)

  1. Hydrogen has a highest calorific value
  2. Fuel having higher mass percentage of hydrogen have high calorific value.
  3. Any fuel containing oxygen has high calorific value because oxygen it self undergoes combustion
  4. Calorific value of natural gas is more than petroleum gas
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NEUTRAL POINTS Neutral points are the points at which two magnetic fields are equal in magnitude, but opposite in direction. The net magnetic field at a neutral point is zero. A compass needle if placed at the neutral point, will rest in any direction. The two magnetic fields can be either due to two separate magnets or they can be one due to a magnet and other due to the earth's magnetic field. The magnetic field due to a magnet decreases as the distance from the magnet increases. Outside the magnet, it is in a direction Fig. 10.10 Magnetic field lines of a bar magnet from its north-pole towards the south-pole. The when its north pole faces geographic south earth's magnetic field has two components : From Fig. 10.10, we notice that (a) Horizontal component in a direction from (i) The magnetic field lines are curved in geographic south to geographic north and the vicinity of the magnet and they are mainly (b) vertical component in a vertically downward due to the magnetic field of the magnet which is direction. The position of neutral point or neutral much stronger than the earth's magnetic field. As points in some cases is given below. the distance from the magnet increases, the (i) For two magnets at a separation in one strength of the magnetic field due to the magnet line with their like poles facing each other, the decreases and at distant points, it becomes weaker neutral point is at some point between the two than the earth's magnetic field. The magnetic field magnets. lines are nearly parallel straight lines from south (ii) For a magnet standing vertical with its to north, at distant points from the magnet. They north pole up, the neutral point will be at some are mainly due to the earth's magnetic field. point on the vertical line away from its north pole. (ii) There are two points equidistant from the (iii) The neutral points are situated centre of the magnet marked as in Fig. symmetrically on either side of a magnet at equal in north and south directions where the magnetic distances from the centre in east-west direction, field of the magnet and the horizontal component if the north pole of the magnet faces towards of the earth's magnetic field are equal in magnitude geographic north (Fig. 10.9). but in opposite directions such that the two fields (iv) The neutral points are on either side of the neutralise each other. At these points, the compass needle remains unaffected and the needle comes to magnet at equal distances from the centre in northrest pointing in any direction. These points are south directions, if the south pole of the magnet neutral points. faces towards geographic north (Fig. 10.10).
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Question Text
Which of the following statement is false? (JSTSE, 2014)
Updated OnNov 22, 2022
TopicPhysics
SubjectScience
ClassClass 9
Answer Type Video solution: 1
Upvotes122
Avg. Video Duration5 min