Electrostatics

31. Dielectric constant for mica is nearly

200
100
3 to 8
1 to 2

Detailed SolutionDielectric constant for mica is nearly

32. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

0.56 x 1015 m/s2
1.5 x 1015 m/s2
1.6 x 1015 m/s2
1.76 x 1015 m/s2

Detailed SolutionTwo infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

33. Which of the following capacitors can be used for temperature compensation ?

Air capacitor
Ceramic capacitor
Paper capacitor
None of the above

Detailed SolutionWhich of the following capacitors can be used for temperature compensation ?

34. capacitors are used in transistor circuits.

Ceramic
Paper
Air
Electrolytic

Detailed Solutioncapacitors are used in transistor circuits.

35. A capacitance of 100 uF is connected in series with a resistance of 8000 ohm. The time constant of the circuit is

0.2 s
0.4 s
0.6 s
0.8 s

Detailed SolutionA capacitance of 100 uF is connected in series with a resistance of 8000 ohm. The time constant of the circuit is

36. A capacitance is a circuit component that opposes the change in circuit

current
voltage
impedance
none of the above

Detailed SolutionA capacitance is a circuit component that opposes the change in circuit

37. Dielectric strength of mica is

10 to 20 kV/mm
30 to 50 kV/mm
50 to 200 kV/mm
300 to 500 kV/mm

Detailed SolutionDielectric strength of mica is

38. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

5 times smaller than before
5 times greater than before
10 times greater than before
25 times larger than before

Detailed SolutionA positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

39. An electrolytic capacitor can be used for

D.C. only
A
only B. AC. only C. both
none of the above

Detailed SolutionAn electrolytic capacitor can be used for

40. Capacitance increases with

increase in plate area and decrease in distance between the plates
increase in plate area and distance between the plates
decrease in plate area and value of applied voltage
reduction in plate area and distance between the plates

Detailed SolutionCapacitance increases with

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