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Magnetic Materials – 1 – 2

6. The relative permeability of a paramagnetic substance is :

(a) unity
(b) slightly more than unity
(c) zero
(d) less than unity

Answer
Answer : (b)

Explanation
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7. Ferroelectric materials are characterised by :

(a) Very high degree of polarisation
(b) A sharp dependence of polarisation on temperature
(c) Non-linear dependence of the charge Q on the applied voltage
(d) All the above

Answer
Answer : (d)

Explanation
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8. In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it.

(a) Increased
(b) Decreased
(c) Remains unchanged
(d) Becomes zero

Answer
Answer : (c)

Explanation
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9. Magnetic materials :

(a) provide path to magnetic flux
(b) are good insulators
(c) are semiconductors
(d) None

Answer
Answer : (a)

Explanation
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10. Hard magnetic materials are used for making :

(a) Permanent magnets
(b) Temporary magnets
(c) Conductors
(d) Insulator

Answer
Answer : (a)

Explanation
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