A magnet (primary) oscillates with frequency ν1 in earth's magnetic field (BH) alone. Now a secondary magnet is placed near the primary magnet. If B is the magnetic field of the second magnet on the primary magnet in the direction of BH, the primary magnet oscillates with frequency ν2, then the ratio of B/BH is :

1. ν2ν12

2. v2v12-1

3. ν2ν12 + 1

4. ν1ν22-1

 

Subtopic:  Bar Magnet |
 64%
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The angle of dip is θ1 on a given meridian which is at an angle θ with the magnetic meridian. If θ2 is the angle of dip on another meridian which is perpendicular to the first meridian, then θ, θ1 and θ2 are related as :

1. cot2θ = cot2θ1+cot2θ2

2. tan2θ = tan2θ1+tan2θ2

3. tanθtanθ1tanθ2

4. tanθ = tanθ1 + tanθ2

Subtopic:  Earth's Magnetism (OLD NCERT) |
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The magnetic susceptibility χ of a ferromagnetic material varies with temperature, as:

1.  2.
3. 4.

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 65%
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Which of the following is not dimensionless?
(where symbols stand for their usual meanings in magnetism)

1. IH

2. Bμ0H

3. μr

4. μrBH

Subtopic:  Magnetization & Magnetic Intensity |
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The unit of intensity of the magnetising field is :

1.NWb

2. Jm3×tesla

3. Jm×Wb

4. All of these

 

Subtopic:  Magnetization & Magnetic Intensity |
 81%
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If at any place, the angle of dip is  θ and magnetic latitude is λ, then (assume that the axis of earth's magnetic moment coincides with axis of rotation of the earth)

1. θ =  λ

2. tanθ = cosλ

3. tanθ.cotλ = 2

4. tanθ.cotλ =12

Subtopic:  Earth's Magnetism (OLD NCERT) |
 51%
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If A is the area of the graph of the intensity of magnetisation in ferromagnetic material versus magnetising field intensity, V is the volume of the magnetic sample and n is the frequency of alternating magnetic field, then the rate of hysteresis loss in the substance is 

1. A

2. AVn

3. AVn

4. AnV

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 60%
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A magnet is oscillating with the time period 'T' in a vertical plane. If the angle of dip at that place is 60° and the magnet is restricted to oscillate in the horizontal plane, then the time period of oscillations will be :

1. T

2. T2

3. 2T

4. 2T

Subtopic:  Earth's Magnetism (OLD NCERT) |
 62%
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The magnetic susceptibility of a substance is -0.0002 at room temperature. If this substance is kept in a uniform external magnetic field B, the net field inside the substance becomes B', then :

1. B'>B

2. B'<B

3. B' = B

4. B' = 0

Subtopic:  Magnetization & Magnetic Intensity |
 68%
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The true value of the angle of dip at a place is θ. If the plane of the dip circle is at 30° with the magnetic meridian, the angle of dip is θ'. Then one concludes that :

1. θ' = θ

2. θ'<θ

3. θ'>θ

4. θ' = θ+30°

Subtopic:  Earth's Magnetism (OLD NCERT) |
 61%
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