Physics MCQs

Physics

Electrostatics


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#25

The dielectric constant of vacuum is

A) 1

B) 0

C) 8

D) -1

Answer:   A
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#26

The dielectric constant of air is approximately

A) 1

B) 1.0006

C) 2

D) 3

Answer:   B
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#27

The dielectric constant of water is about

A) 80

B) 60

C) 40

D) 20

Answer:   A
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#28

The dielectric constant of mica is about

A) 3

B) 5

C) 7

D) 9

Answer:   C
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#29

Gauss's law states that the electric flux through a closed surface is equal to

A) $\frac{1}{\epsilon_{0}}$ times the charge enclosed

B) $\epsilon_{0}$ times the charge enclosed

C) $\frac{1}{\epsilon_{0}}$ times the total charge

D) $\epsilon_{0}$ times the total charge

Answer:   A
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#30

The electric flux through a closed surface is zero if

A) No charge is enclosed

B) The net charge enclosed is zero

C) Both A and B

D) Neither A nor B

Answer:   C
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#31

The electric field due to an infinite plane sheet of charge is

A) $\frac{\sigma}{2\epsilon_{0}}$

B) $\frac{\sigma}{\epsilon_{0}}$

C) $\frac{2\sigma}{\epsilon_{0}}$

D) $\frac{\sigma}{4\epsilon_{0}}$

Answer:   A
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#32

The electric field due to an infinite line charge is

A) $\frac{\lambda}{2\pi\epsilon_{0}r}$

B) $\frac{\lambda}{4\pi\epsilon_{0}r}$

C) $\frac{2\lambda}{\pi\epsilon_{0}r}$

D) $\frac{\lambda}{\pi\epsilon_{0}r}$

Answer:   A
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