A bar magnet of length l and magnetic dipole moment M is bent to form an arc which subtends an angle of 120° at centre. The new magnetic dipole moment will be

1.  3M2π

2.  33M2π

3.  3Mπ

4.  2Mπ

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

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Earth's magnetism
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The unit of pole strength is

(1) Am2

(2) Am

(3) A2m

(4) A2m2

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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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Two small bar magnets are placed in air at a distance r apart. The magnetic force between them is proportional to

(1) r2

(2) r-2

(3) r-3

(4) r-4

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Analogy between electrostatics and magnetostatics
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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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Earth's magnetism
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A short magnetic dipole is placed at the origin with its dipole movement directed along the +x-axis. If magnetic field induction at a point P (r, 0) is Bi^, the magnetic field induction at point Q(0,2r) will be

(1) -B16i^

(2) -B8j^

(3) B16j^

(4) -B16j^

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Analogy between electrostatics and magnetostatics
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The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is
(a) 2-3

(b) 2-13

(c) 23

(d) 213

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A magnet of magnetic moment 20 C.G.S. units are freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30o in C.G.S. units is
(a) 6

(b) 33

(c) 3(2-3)

(d) 3

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Analogy between electrostatics and magnetostatics
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The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is


1. 100 Gauss               2. 400 Gauss
3. 50 Gauss                 4. 200 Gauss

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Analogy between electrostatics and magnetostatics
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