MCQ’s on Static Electricity|Objective Questions Electric field

1. The unit of absolute permittivity of a medium is

(a) joule/coulomb

(b) newton-metre

(c) farad/metere

(d) farad/coulomb

2. If relative permittivity of mica is 5, its absolute permittivity is

(a) 5 ฮต0 (b) 5/ฮต0

(c) ฮต0/5 (d) 8.854 ร— 10โˆ’12

3. Two similar electric charges of 1 C each are placed 1 m apart in air. Force of repulsion between them would be nearly…… newton

(a) 1

(b) 9 ร— 109

(c) 4 ฯ€

(d) 8.854 ร— 10โˆ’12

4. Electric flux emanating from an electric charge of + Q coulomb is

(a) Q/ฮต0 (b) Q/ฮตr

(c) Q/ฮต0ฮตr (d) Q

5. The unit of electric intensity is

(a) joule/coulomb

(b) newton/coulomb

(c) volt/metre

(d) both (b) and (c)

6. If D is the electric flux density, then value of electric intensity in air is

(a) D/ฮต0 (b) D/ฮต0ฮตr

(c) dV/dt (d) Q/ฮตA

7. For any medium, electric flux density D is related to electric intensity E by the equation

(a) D = ฮต0 E (b) D = ฮต0ฮตr E

(c) D = E/ฮต0ฮตr (d) D = ฮต0E/ฮตr

8. Inside a conducting sphere,…remains constant

(a) electric flux

(b) electric intensity

(c) charge

(d) potential

9. The SI unit of electric intensity is

(a) N/m

(b) V/m

(c) N/C

(d) either (b) or (c)

10. According to Gaussโ€™s theorem, the surface integral of the normal component of electric flux density D over a closed surface containing charge Q is

(a) Q (b) Q/ฮต0

(c) ฮต0 Q (d) Q2/ฮต0

11. Which of the following is zero inside a charged conducting sphere ?

(a) potential

(b) electric intensity

(c) both (a) and (b)

(d) both (b) and (c)

12. In practice, earth is chosen as a place of zero electric potential because it

(a) is non-conducting

(b) is easily available

(c) keeps lossing and gaining electric

charge every day

(d) has almost constant potential.

ANSWERS

1. c 2. a 3. b 4. d 5. d 6. a

7. b 8. d 9. d 10. a 11. c 12. d

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