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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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

9. Magnetic materials :

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

ANSWER

EXPLANATION

10. Hard magnetic materials are used for making :

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

ANSWER

EXPLANATION

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