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Standard XII
Physics
Hysteresis
Question

Permanent magnet has properties retentivity and coercivity respectively as:
  1. high-high
  2. low-high
  3. high-low
  4. low-low

A
low-low
B
high-low
C
low-high
D
high-high
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Solution
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The material for a permanent magnet should have high retentivity (so that magnet is strong) and high coercivity (so that magnetism is not wiped out by strong magnetic fields).

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Similar Questions
Q1
Permanent magnet has properties retentivity and coercivity respectively as:
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Q2
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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Q3
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
(d) low retentivity and low coercive force
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Q4
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.

Assertion(A) : AlNiCo is used for making permanent magnets.

Reason(R) : It has a high retentivity and high coercivity.
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Q5
The figure gives experimentally measured B−H variation in a ferromagnetic material. Its retentivity, coercivity and saturation magnetization, respectively are:



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