3. Which of the following materials is generally
used as the core of an electromagnet?
(a) Steel
(b) Iron
(c) Alnico
(d) Magnetite
4. Which of the following is not true of magnetic
lines of force?
(a) They do not intersect each other.
(b) They are continuous curves.
(c) They are crowded together where the magnetic field is weak.
(d) They go from the north pole to the south
pole outside a magnet and from the south pole to the north pole inside it.
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