The figure illustrates how B, the flux density, inside a sample of unmagnetized ferromagnetic material varies with B0, the magnetic flux density, in which the sample is kept. For the sample to be suitable for making a permanent magnet:

1. OQ should be large and OR should be small

2. OQ and OR should both be large

3. OQ should be small and OR should be large

4. OQ and OR should both be small

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 75%
From NCERT
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The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph

1. OD                            2. OC

3. OB                            4. OA

Subtopic:  Magnetization & Magnetic Intensity |
 70%
From NCERT
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A current-carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III & IV. The decreasing order of potential energy is:

1. I > III > II > IV 2. I > II >III > IV
3. I > IV > II > III 4. III > IV > I > II

 
Subtopic:  Analogy between Electrostatics & Magnetostatics |
 64%
From NCERT
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A 250-turn rectangular coil with a length of 2.1 cm and a width of 1.25 cm carries 85 \(\mu\)A and is subjected to a magnetic field with a strength of 0.85 T. What is the work done to rotate the coil by 180 degrees against the torque?

1. 9.1 μJ

2. 4.55 μJ

3. 2.3 μJ

4. 1.5 μJ

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 58%
From NCERT
NEET - 2017
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If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by 

(1) cot2θ=cot2θ1+cot2θ2

(2) tan2θ=tan2θ1+ tan2θ2

(3) cot2θ=cot2θ1-tan2θ2

(4) tan2θ=tan2θ1-tan2θ2

Subtopic:  Earth's Magnetism (OLD NCERT) |
 79%
NEET - 2017
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A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\)Now the torque required to keep the magnet in this new position is:
1. \(\frac{W}{\sqrt{3}}\) 
2. \(\sqrt{3} W\)
3. \(\frac{\sqrt{3} W}{2}\) 
4. \(\frac{2 W}{\sqrt{3}}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 79%
From NCERT
NEET - 2016
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The magnetic susceptibility is negative for

1. paramagnetic material only

2. ferromagnetic material only

3. paramagnetic and ferromagnetic materials

4. diamagnetic material only

Subtopic:  Magnetic Materials |
 86%
From NCERT
NEET - 2016
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The following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole. Which configuration has the highest net magnetic dipole moment? 

1. 2.
3. 4.
Subtopic:  Bar Magnet |
 67%
From NCERT
NEET - 2014
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A bar magnet of length L and magnetic dipole moment M is bent in the form of an are as shown in figure. The new magnetic dipole moment will be


(1)M

(2)3M/π

(3)2/πM

(4)M/2

Subtopic:  Bar Magnet |
 78%
NEET - 2013
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A magnetic needle suspended parallel to a magnetic field requires 3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be

1. 23J                     

2. 3 J

3. 3 J                       

4. 32 J

Subtopic:  Bar Magnet |
 71%
From NCERT
NEET - 2012
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