6. All materials have :
(a) paramagnetic property
(b) diamagnetic property
(c) ferromagnetic property
(d) ferrimagnetic property
7. If B is the intensity of the earth’s magnetic field and θ is the angle of dip at a place, the vertical intensity Bv at the place is :
(a) B cos θ
(b) B tan θ
(c) B2tan θ
(d) B sin theta;
8. Which of the following materials has a very high positive susceptibility?
(a) diamagnetic material
(b) ferromagnetic material
(c) paramagnetic material
(d) anti ferromagnetic material
9. Steel is preferred to soft iron for making permanent magnet because :
(a) coercivity of steel is zero
(b) coercivity of steel is low
(c) coercivity of steel is high
(d) none of these
10. The unit of relative permeability of a medium is :
(a) henry
(b) no unit
(c) newton
(d) metre/sec
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Magnetism » Exercise - 17. If B is the intensity of the earth’s magnetic field and θ is the angle of dip at a place, the vertical intensity Bv at the place is : (a) B cos θ (b) B tan θ (c) B2tan θ (d) B sin θ- Magnetism » Exercise - 13. The magnetic field at any point on the axial line of a short magnet is : (a) equal to the magnetic field at an equidistant point on its equatorial line (b) twice the magnetic field at an equidistant point on its equatorial line (c) zero (d) half the magnetic field at an equidistant point on its equatorial line
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