Each atom of an iron bar (5 cm × 1 cm × 1 cm) has a magnetic moment 1.8×10-23 Am2 . Knowing that the density of iron is 7.78×103 kgm-3 atomic weight is 56 and Avogadro's  number is 6.02×1023 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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A dip needle lies initially in the magnetic meridian when it shows an angle of dip θ at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip θ' . Then tan θ'tan θ is

1. 1/cos x

2. 1/sin x

3. 1/tan x

4. cos x

 

Concept Questions :-

Earth's magnetism
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


A bar magnet has coercivity 4×103 Am-1. 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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The variation of magnetic susceptibility (χ) with temperature for a diamagnetic substance is best represented by

1. 

2. 

3. 

4. 

Concept Questions :-

Magnetic materials
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The variation of magnetic susceptibility (χ) with absolute temperature T for a ferromagnetic material is

Concept Questions :-

Curie law and hyterisis
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The relative permeability (μr) of a ferromagnetic substance varies with temperature (T) according to the curve

(a) A                               (b) B

(c) C                               (d) D

Concept Questions :-

Magnetic materials
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

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) 10-4 T                         (b) 2×10-4 T

(c) 0.5×10-4 T                 (d) None of these

Concept Questions :-

Analogy between electrostatics and magnetostatics
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: