Which inductor is linear? Air cored Cast iron cored Sheet steel cored Iron alloy

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Correct Answer

Air cored

Explanation

For magnetic materials, permeability is not constant.

Materials and Components problems

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3. If W_F is the Fermi level, then in a metal at T = 0
Options
A. all energy levels above W_F filled, all those below W_F are empty
B. all energy levels below W_F are filled, all those above W_F are empty
C. some energy levels, both below and above W_F, are filled
D. all energy levels below and above W_F are filled

4. A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 10⁴ V/m. If the space between the plates is filled with a material having ?_r = 10, then the value of field in the dielectric will be
Options
A. 2 x 10³ V/m
B. x 10⁴ V/m
C. 210 x 10⁴ V/m
D. 2 x 10⁵ V/m

5. In van der walls crystals, there exists a high degree of stability of the outer electron shell.
Options
A. True
B. False

6. The units for intrinsic strength of dielectric are
Options
A. kV
B. kV/m
C. A
D. A/m

9. Assertion (A): Holes are majority carriers in p type semiconductor.
Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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