162. Indicate which of the following material does not retain magnetism permanently.
A. Soft iron
B. Stainless steel
C. Hardened steel
D. None of the above
163. The main constituent of perm-alloy is
A. cobalt
B. chromium
C. nickel
D. tungsten
164. The use of permanent magnets is not made in
A. magnetoys
B. transformers
C.anteena
D.material
165. Paramagnetic permeability
A. slightly less than unity
B. equal to unity
C. slightly more than unity
D. equal to that ferromagnetic materials
166. Two infinitely long parallel conductors in vacuum and separated 1 metre between centres when a current of materials have relative of 100 produce on each other a force of
A. 2 x 10-2 N/m
B. 2 x 10-3 N/m
C. 2 x 10-5 N/m
D. 2 x 10-7 N/m
167. Which of the following is a ferromagnetic material?
A. Tungsten
B. Aluminium
C. Copper
D. Nickel
168. Gilbert is a unit of
A. electromotive force
B. magnetomotive force
C. conductance
D. permittivity
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