K.C.S.E Physics Q & A - MODEL 1998PP2QN01
.a) In an experiment to determine the strength of an electromagnet, the weight of pins that can be supported by the electromagnet, was recorded against the number of turns. The current was kept constant throughout the experiment. Table 1 shows the data obtained.
(i) Plot a graph of weigh, W (y-axis) against the number of turn's n
(ii) Use the domain theory to explain the nature of the curve. (iii) Sketch on the same axes, the curve that would be obtained using a higher current. b) Using a labeled diagram, explain the working of a simple relay.
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