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.Management Sciences
Category: Electrostatics
Which of the following statements is correct ___________?
A. Air capacitors have a black band to indicate the outside foil
B. Electrolytic capacitor must be connected in the correct polarity
C. Ceramic capacitors must be connected in the correct polarity
D. Mica capacitors are available in capacitance value of 1 to 10 pF
Electric intensity at infinite distance from the point charge is_____________?
A. zero
B. infinite
C. positive
D. negative
The bridge used for the measurement of the value of the capacitance is____________?
A. Wien’s bridge
B. Wheatstone bridge
C. Schering bridge
D. Hay’s bridge
A dielectric material must be____________?
A. resistor
B. insulator
C. good conductor
D. semi conductor
An electric field can deflect_______________?
A. Neutrons
B. X-rays
C. Both glass rod and silk acquire a negative charge
D. None
Which of the following statement is true __________?
A. The current in the discharging capacitor grows linearly
B. The current in the dicharging capacitor grows exponentially
C. The current in the discharging capacitor decays exponentially
D. The current in the discharging capacitor decreases constantly
Electric field intensity is a quantity_____________?
A. scalar
B. vector
C. both A. and (6)
D. none of the above
Which medium has the least dielectric strength ____________?
A. Paraffin wax
B. Quartz
C. Glass
D. Air
The capacitance of a capacitor is not affected by____________?
A. distance between plates
B. area of plates
C. thickness of plates
D. all of the above
A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?
A. 100 kV/m
B. 10 kV/m
C. 5 kV/m
D. 2 kV/m
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