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 is
rotated by 1800, neutral point shall be obtained at distance:
1.  2r                                         2.  2r
3.  2-13r                                  4.  r22

Subtopic:  Earth's Magnetism (OLD NCERT) |
 54%
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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°

Subtopic:  Earth's Magnetism (OLD NCERT) |
 63%
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A magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strength B. The work done in rotating it by an angle of 180o will be

(1) -MB                        

(2) +MB

(3) 0                            

(4) +2MB

Subtopic:  Bar Magnet |
 79%
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A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be

1. M2,m2

2. M,m2

3. M2,m

4. M, m

Subtopic:  Bar Magnet |
 78%
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Two identical thin bar magnets each of length l and pole strength m are placed at the right angle to each other with the north pole of one touching south pole of the other. The magnetic moment of the system is :

1. ml

2. 2ml

3. 2ml

4. 12ml

Subtopic:  Bar Magnet |
 87%
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Force between two identical bar magnets whose centres are r metre apart  is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to

1. 2.4N                         2. 1.2N

3. 0.6N                         4. 0.3N

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)

1. 

2. 

3. 

4. 

Subtopic:  Bar Magnet |
 63%
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Two similar bar magnets P and Q, each of magnetic moment M, are taken. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have

1. Equal pole strength          2. Magnetic moment M/4

3. Magnetic moment M/2      4. Magnetic moment M

Subtopic:  Bar Magnet |
 70%
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A dip needle in a plane perpendicular to magnetic meridian will remain:
1. Vertical
2. Horizontal
3. In any direction
4. At an angle of dip to the horizontal

Subtopic:  Earth's Magnetism (OLD NCERT) |
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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:

1. tan-134                     

2. sin-134

3. tan-143                     

4. sin-135

Subtopic:  Earth's Magnetism (OLD NCERT) |
 73%
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