Materials suitable for permanent magnet, must have which of the following properties?
High retentivity, low coercivity and high permeability
Low retentivity, low coercivity and low permeability
Low retentivity, high coercivity and low permeability
High retentivity, high coercivity and high permeability
A
High retentivity, low coercivity and high permeability
B
Low retentivity, high coercivity and low permeability
C
High retentivity, high coercivity and high permeability
D
Low retentivity, low coercivity and low permeability
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Solution
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Materials suitable for permanent magnets should have high retentivity, high coercivity and high permeability.
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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
(c) low retentivity and high coercive force
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Q5
In the given question, a statement of Assertion (A) is given, followed by a corresponding statement of Reason (R) just below of it. Mark the correct answer.
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