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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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

Subtopic:  Earth's Magnetism (OLD NCERT) |
 87%
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Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making an angle θ with the magnetic meridian such that

(a) θ=tan-113            (b) θ=tan-13

(c) θ=tan-112               (d) θ=tan-134

Subtopic:  Earth's Magnetism (OLD NCERT) |
 60%
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The angle of dip at a certain place is 30o. If the horizontal component of the earth’s magnetic field is H, the intensity of the total magnetic field is

1. H2                            2. 2H3

3. H2                         4. H3

Subtopic:  Earth's Magnetism (OLD NCERT) |
 83%
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