Electrostatics

11. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

60 N
30 N
40 N
15 N

Detailed SolutionThe force between two charges is 120 N. If the distance between the charges is doubled, the force will be

12. Which of the following materials has the highest value of dielectric constant?

Glass
Vacuum
Ceramics
Oil

Detailed SolutionWhich of the following materials has the highest value of dielectric constant?

13. Dielectric strength ______ with increasing thickness

increases
decreases
remains unaltered
none of the above

Detailed SolutionDielectric strength ______ with increasing thickness

14. The capacitance between two plates increases with

shorter plate area and higher applied voltage
shorter plate area and shorter distance between them
larger plate area, longer distance between plates and higher,applied voltage
larger plate area and shorter distance between plates

Detailed SolutionThe capacitance between two plates increases with

15. A condenser suitable for D.C. only is

Metallic plate variable gang condenser
Metallic paper capacitor
only is A. Metallic plate variable gang condenser B. Metallic paper capacitor C. Oil impregnated paper condenser
Poled aluminium electrolytic condenser

Detailed SolutionA condenser suitable for D.C. only is

16. The unit of dielectric strength is given by

V/m
V2/m
m/V
m/V2

Detailed SolutionThe unit of dielectric strength is given by

17. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?

Paper capacitor
Ceramic capacitor
Electrolytic capacitor
Any-of the above

Detailed SolutionA capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?

18. For closer tolerances which of the following capacitors is usually preferred ?

Paper capacitor
Mica capacitor
Ceramic disc capacitor
None of the above

Detailed SolutionFor closer tolerances which of the following capacitors is usually preferred ?

19. The presence of an uncharged conductor near a charged one increases the

charge of the charged conductor
capacity of the charged conductor
potential of the charged conductor
all of the above

Detailed SolutionThe presence of an uncharged conductor near a charged one increases the

20. When a dielectric is placed in an electric field the field strength

decreases
increases
reduces to zero
remain unchanged

Detailed SolutionWhen a dielectric is placed in an electric field the field strength

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