A magnet of magnetic moment 50i ^A-m2 is placed along the x-axis in a magnetic field B=(0.5i^+3.0j^)T. The torque acting on the magnet is

1. 175 k^ N-m

2. 150 k^ N-m

3. 75 k^ N-m

4. 2537 k^ N-m

Concept Questions :-

Analogy between electrostatics and magnetostatics
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Two lines of force due to a bar magnet

1. Intersect at the neutral point

2. Intersect near the poles of the magnet

3. Intersect on the equatorial axis of the magnet

4. Do not intersect at all

Concept Questions :-

Magnetic field and field lines
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The magnetic field lines due to a bar magnet are correctly shown in

1. 

2. 

3. 

4. 

Concept Questions :-

Magnetic field and field lines
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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

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

Earth's magnetism
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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

Concept Questions :-

Earth's magnetism
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