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
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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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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
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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

Concept Questions :-

Curie law and hyterisis
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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

Concept Questions :-

Magnetization and magnetic intensity
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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 

(a) cot2θ=cot2θ1+cot2θ2

(b) tan2θ=tan2θ1-tan2θ2

(c) cot2θ=cot2θ1-tan2θ2

(d) tan2θ=tan2θ1-tan2θ2

Concept Questions :-

Earth's magnetism
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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 is W. Now the torque required to keep the magnet in this new position is

1. W3                    2. 3W

3. 3W2                4. 2W3

Concept Questions :-

Analogy between electrostatics and magnetostatics
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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

Concept Questions :-

Magnetic materials
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The following figures show the arrangement of bar magnet in different configurations. Each magnet has magnetic dipole moment m. Which configuration has the highest net magnetic dipole moment?
(i) (ii) (iii) (iv)


1. (i)

2. (ii)

3. (iii)

4. (iv)

Concept Questions :-

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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole.It

(a) will become rigid showing no movement

(b) will stay in any position

(c) will stay in north-south direction only

(d) will stay in east-west direction only

Concept Questions :-

Magnetic field and field lines
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