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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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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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
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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  be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by

(a) $co{t}^{2}\theta =co{t}^{2}{\theta }_{1}+co{t}^{2}{\theta }_{2}$

(b) ${\mathrm{tan}}^{2}\theta ={\mathrm{tan}}^{2}{\theta }_{1}-{\mathrm{tan}}^{2}{\theta }_{2}$

(c) $co{t}^{2}\theta =co{t}^{2}{\theta }_{1}-{\mathrm{tan}}^{2}{\theta }_{2}$

(d) ${\mathrm{tan}}^{2}\theta ={\mathrm{tan}}^{2}{\theta }_{1}-{\mathrm{tan}}^{2}{\theta }_{2}$

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 ${60}^{\circ }$ 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. $\frac{2W}{\sqrt{3}}$

Concept Questions :-

Analogy between electrostatics and magnetostatics
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Difficulty Level: