A small bar magnet is placed with its north pole facing magnetic north pole.The neutral points are located at distance r from its centre. If magnet isrotated by 1800, neutral point shall be obtained at distance:1.  2r                                         2.  2r3.  2-13r                                  4.  r22

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Earth's magnetism
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If a magnet is suspended at angle 30° to the magnetic meridian, the dip needle makes an angle of 45° with the horizontal. The value of real dip angle at the place is

1.  tan-1 32

2.  tan-1 1

3.  tan-1 12

4.  tan-123

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Earth's magnetism
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The vertical component of the earths magnetic field is zero at

(1) Magnetic poles

(2) Magnetic equator

(3) Geographic poles

(4) Geographic equator

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A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is :

a) 0                           (b) 45°

(c) 60°                       (d) 90°

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Earth's magnetism
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A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be

(a) 8                               (b)122

(c) 3                               (d) 4

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Earth's magnetism
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A dip needle in a plane perpendicular to magnetic meridian will remain

(a) Vertical

(b) Horizontal

(c) In any direction

(d) At an angle of dip to the horizontal

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Earth's magnetism
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If the angles of dip at two places are 30o and 45o respectively, then the ratio of horizontal  components of earth's magnetic field at the two places will be

(a) 3:2                       (b) 1:2

(c) 1:3                          (d) 1:2

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Earth's magnetism
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A line passing through places having zero value of magnetic dip is called

(a) Isoclinic line             (b) Agonic line

(c) Isogonic line             (d) Aclinic line

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Earth's magnetism
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The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is

(a) tan-134                      (b) sin-134

(c) tan-143                      (d) sin-135

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Earth's magnetism
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At a certain place, the horizontal component B0 and the vertical component V0 of the earth's magnetic field are equal in magnitude. The total intensity at the place will be

1. B0                            2. B02

3. 2B0                          4. 2B0

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Earth's magnetism
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