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Materials and Components problems

3. Fleming's left hand rule is used to find
Options
A. direction of force on a current carrying conductor
B. direction of flux in solenoid
C. direction of magnetic field due to a current carrying conductor
D. direction of induced emf

4. Which inductor is used at high frequencies?
Options
A. Cast iron cored
B. Sheet steel cored
C. Iron alloy cored
D. Ceramic cored

6. By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored in the capacitor is increased five times. The dielectric constant of material is
Options
A.
B.
C. 5
D. 25

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

8. 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

9. 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

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