When a dielectric is subjected to an electric field E, each volume element of di

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Question
When a dielectric is subjected to an electric field E, each volume element of dielectric can be considered to be carrying an electric dipole moment.
Options
A. True
B. False

Correct Answer

True

Materials and Components problems

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2. The temperature coefficient of resistivity of semiconductors is
Options
A. positive
B. negative
C. may be positive or negative
D. very low

4. Assertion (A): In an intrinsic semiconductor J = (?_n x ?_p)en_i.
Reason (R): Intrinsic charge concentration n_i at temperature T is given by n_i² = A₀ T³ e^-E_G0/kT.
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

5. A parallel plate capacitor has area of plate A and plate separation d. Its capacitance is C. A metallic plate P of area A and negligible thickness is added as shown in Figure. The new value of capacitance is
Options
A. C
B. 2C
C. 0.5 C
D. 0.25 C

6. Assertion (A): Doping level in extrinsic semiconductors is very small.
Reason (R): Additional of impurity in the ratio of 1 part in 10⁸ parts increases the number of charge carriers by about 20.
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. An electron in a metal suffers collision and if the probability of it being scattered over an angle d? is 2p P(?) sin ? d? where P(?) is an arbitrary function of scattering angle ?, then
Options
A. 2pP(?) sin ? d? = 0
B. 2pP(?) sin ? d? = 2
C. 2pP(?) sin ? d? = -1
D. 2pP(?) sin ? d? = 1

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