The iron core of a coil is removed so that it becomes an air cored coil. Its ind

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Question
The iron core of a coil is removed so that it becomes an air cored coil. Its inductance will
Options
A. increase
B. decrease
C. remain the same
D. may increase or decrease

Correct Answer

decrease

Explanation

Because magnetic flux will decrease.

Materials and Components problems

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1. At T = 0, the resistivity of a perfect single crystal of a metal is
Options
A. 0
B. low
C. high
D. finite

2. From a homogeneous and isotropic dielectric material of dielectric constant ?_r, a small volume element is taken out creating a cavity. The field can be kept homogeneous if D_i. (i.e., electric flux density inside the cavity) and D₀ (i.e., electric flux density outside the cavity) are such that
Options
A. D₀ = D_i
B.
C.
D. either (a) or (b)

4. The chemical properties of atoms are determined by all the electrons and their configuration.
Options
A. True
B. False

5. The law that (where K is thermal conductivity, ? is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as
Options
A. Lorentz law
B. Wiedemann Franz law
C. Curie Weiss law
D. Kittel law

6. In a metal the probability of a state 0.1 eV below Fermi level being occupied
Options
A. is more than the probability of state 0.1 eV above Fermi level being occupied
B. is the same as the probability of state 0.1 eV above Fermi level being occupied
C. is less than the probability of state 0.1 eV above Fermi level being occupied
D. may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied

8. Electrical conductivity of metals expressed in ohm^-1 m^-1 is of the order of
Options
A. 10¹⁰
B. 10⁵
C. 10^-4
D. 10^-6

9. In a polyatomic gas, the types of polarization which exist together are
Options
A. electronic and orientational
B. electronic and ionic
C. ionic and orientational
D. electronic, orientational and ionic

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