The material for making permanent magnets should have
high retentivity, high coercivity
low retentivity, high coercivity
high retentivity, low coercivity
low retentivity, low coercivity
A
high retentivity, high coercivity
B
high retentivity, low coercivity
C
low retentivity, low coercivity
D
low retentivity, high coercivity
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Solution
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Factual. The material for making permanent magnets should have high retentivity and high coercivity.
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Q1
The desirable properties for making permanent magnets are
(a) high retentivity and high coercive force
(b) high retentivity and low coercive force
(c) low retentivity and high coercive force
(d) low retentivity and low coercive force
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Electromagnets are made of soft iron because soft iron has
(a) high retentivity and high coercive force
(b) high retentivity and low coercive force
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