An electron in a homogeneous magnetic field and having velocity perpendicular to

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Question
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

Correct Answer

in a circular path

Materials and Components problems

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2. 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

3. 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

5. 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

6. 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

8. 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

9. 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

10. 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

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