Each atom of an iron bar  has a magnetic moment  . Knowing that the density of iron is atomic weight is 56 and Avogadro's  number is the magnetic moment of the bar in the state of magnetic saturation will be

1. 4.75 Am2                  2. 5.74 Am2

3. 7.54 Am2                  4. 75.4 Am2

Concept Questions :-

Analogy between electrostatics and magnetostatics
High Yielding Test Series + Question Bank - NEET 2020

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A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is

1. 0o                             2. 30o

3. 45o                           4. 90o

Concept Questions :-

Earth's magnetism
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A dip needle lies initially in the magnetic meridian when it shows an angle of dip $\theta$ at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip $\theta \text{'}$ . Then  is

1. 1/cos x

2. 1/sin x

3. 1/tan x

4. cos x

Concept Questions :-

Earth's magnetism
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A bar magnet has coercivity . It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

1. 2 A                            2. 4 A

3. 6 A                            4. 8 A

Concept Questions :-

Curie law and hyterisis
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Difficulty Level:

For substances hysteresis (B - H) curves are given as shown in figure. For making temporary magnet which of the following is best.

(a) (b) (c) (d) Concept Questions :-

Curie law and hyterisis
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The variation of magnetic susceptibility $\left(\chi \right)$ with temperature for a diamagnetic substance is best represented by

1. 2. 3. 4. Concept Questions :-

Magnetic materials
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Difficulty Level:

The variation of magnetic susceptibility $\left(\chi \right)$ with absolute temperature T for a ferromagnetic material is Concept Questions :-

Curie law and hyterisis
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The relative permeability $\left({\mu }_{r}\right)$ of a ferromagnetic substance varies with temperature (T) according to the curve (a) A                               (b) B

(c) C                               (d) D

Concept Questions :-

Magnetic materials
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Which curve may best represent the current deflection in a tangent galvanometer ? (a) A                               (b) B

(c) C                               (d) D

Concept Questions :-

Magnetization and magnetic intensity
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Difficulty Level:

Some equipotential surfaces of the magnetic scalar potential are shown in the figure. The magnetic field at a point in the region is (X-axis read in cm) (a)                         (b)

(c)                  (d) None of these

Concept Questions :-

Analogy between electrostatics and magnetostatics