Electrostatics

1. The units of volume charge density are

Coulomb/meter
Coulomb/meter2
Coulomb/meter3
Coulomb/meter4

Detailed SolutionThe units of volume charge density are

2. capacitors are used for audio frequency and radio frequency coupling and tuning.

Air
Mica
Plastic film
Ceramic

Detailed Solutioncapacitors are used for audio frequency and radio frequency coupling and tuning.

3. A capacitor consists of two

Ceramic plates and one mica disc
Insulators separated by a dielectric
Silver-coated insulators
Conductors separated by an insulator

Detailed SolutionA capacitor consists of two

4. at a point is equal to the negative potential gradient at that point.

Electric intensity
Electric flux
Magnetic flux
Magnetic flux density

Detailed Solutionat a point is equal to the negative potential gradient at that point.

5. A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 103 N, is known as

milli-coulomb
micro-coulomb
pico-coulomb
coulomb

Detailed SolutionA charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 103 N, is known as

6. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is

50 joules
150 joules
200 joules
250 joules

Detailed SolutionA capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is

7. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is

100 kV/m
10 kV/m
5 kV/m
2 kV/m

Detailed SolutionA potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is

8. The minimum value of potential gradient in a cable occurs in

insulation
conductor
outer sheath
uniformly all over

Detailed SolutionThe minimum value of potential gradient in a cable occurs in

9. The breakdown voltage for paper capacitors is usually

20 to 60 volts
200 to 1600 volts
2000 to 3000 volts
more than 10000 volts

Detailed SolutionThe breakdown voltage for paper capacitors is usually

10. A paper capacitor is usually available in the form of

tubes
rolled foil
disc
meshed plates

Detailed SolutionA paper capacitor is usually available in the form of

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