A particle of charge Q coulombs is bound elastically to an equilibrium position

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Question
A particle of charge Q coulombs is bound elastically to an equilibrium position with a force constant of f newton per metre. The polarizability of the system is
Options
A.
B.
C.
D. Qf

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1. An homogeneous dielectric material is subjected to an electric field E. If a small cavity is made inside the material, the electric field intensity inside and outside the cavity are different.
Options
A. True
B. False

2. An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
Options
A. perpendicular to the field
B. along the field
C. along a straight line inclined at 45� to field
D. in a circular path

4. 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

5. 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

6. In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.
Options
A. True
B. False

7. An electron shell corresponding to principal quantum number n can contain a maximum of
Options
A. n² electrons
B. 2n² electrons
C. 2n electron
D. n³ electron

8. Assertion (A): Dielectric losses are proportional to tan ?.
Reason (R): tan ? = where ?_r^' and ?_r^" denote the real and imaginary parts of ?_r.
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

10. For a core having a relative permeability ?_r, magnetic dipole moment per unit volume M and field strength H, the flux density B is
Options
A. B = ?_r (H + M)
B. B = ?₀ (H + M)
C. B = ?₀?_r (H + M)
D. B = ?₀?_r (H - M)

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