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WORKSHEET 2(Magnetism and matter)


               1) Which of the following is weakly repelled by a magnetic field:

               (a)iron(b)cobalt              (c)steel                      (d)copper


               2) If a diamagnetic material is placed in a magnetic field , the magnetic field inside the material
               compared to that outside will be

               (a)slightly less               (b)slightly more     (c)very high               (d)same

               3)The permanent magnetic material is characterised by :


               (a)narrow hysteresis loop      (b)broad hysteresis loop   (c)mechanically hard surface
               (d)none of these

               4) The area of B-H loop for soft iron as compared to that for steel is:


               (a)more                     (b)less                    (c)equal                    (d)zero

               5) The value of magnetic susceptibility for a superconductor is:

               (a)zero                       (b)infinity              (c)+1                         (d)-1


               6)The ability of a material to retain magnetism after removal of magnetizing field is
               called_____________.

               7)There is no effect of temperature on______________type of materials.


               8)Two substances A and B have relative permeabilities slightly greater and less than unity
               respectively. What is their magnetic nature?

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               9)An iron rod of 0.2 cm  area of cross-section is subjected to a magnetizing field of 1200 Am . If
               susceptibility of iron is 599, calculate permeability.

               10) Vertical component of earth’s magnetic field at a place is  3 times its horizontal
               component. If total intensity of earth’s magnetic field at the place is 0.4 G, find  (i)angle of dip
               (ii)horizontal component of earth’s magnetic field.
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