UCE PHYSICS 2010 PAPER 2 QTN 3

. (a) Define the following

(i) Hard magnetic material

(ii) Soft magnetic material

(b) (i) Describe the electrical method of magnetizing a steel bar.

(ii) State any two ways of demagnetizing a bar magnet.

(c ) Sketch the magnetic field pattern around a bar magnet with its S-pole pointing north in the earth’s field.

(d) A stiff wire AB is held between opposite poles of two bar magnets and connected to a center-zero galvanometer as shown in figure 2.

The wire AB is kept vertical and moved horizontally along the line CD.

(i) Explain what is observed on the galvanometer as the wire AB moves toward C and toward D.

(ii) Explain what would be observed if the wire was moved along LM.

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