Electrical Engineering · Question Bank

Electrostatics

69 of 100 questions match · page 2 of 4. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 69Problem solving 39Objective 30
DifficultyAll 100Easy 69Medium 25Hard 6
✕ Clear filters
#21📜 EE Pre-Board March 2015📘 PowerhouseEasy
A capacitor is charged 0.23 watt-second of energy at a voltage of 48 volts. What is its capacitance?
A180 μF
B240 μF
C200 μF
D220 μF
#22📜 EE Pre-Board March 2015📘 PowerhouseEasy
What is the capacitance of a parallel-plate capacitor having rectangular plates 10 cm by 20 cm separated by a distance of 0.1 mm? the dielectric is air.
A17.7 pF
B177 pF
C1,770 pF
D17,700 pF
#23📜 EE Pre-Board March 2015📘 PowerhouseEasy
What is the relative permittivity of vacuum?
AUnity
B\(8.854 \times 10^{-12}\)
C8.854
Dzero
#24📜 EE Pre-Board August 2015📘 PowerhouseEasy
Three capacitance of 4μF, 6 μF, and 5 μF are connected in series across a 110-volt dc source. Find the charge passing through each capacitor.
A1,650 μC
B69 μC
C178 μC
D7.33 μC
#25📜 EE Pre-Board August 2015📘 PowerhouseEasy
Two charges of \(2 \times 10^{-5}\) C and \(3 \times 10^{-6}\) C are placed 10 cm apart. Find the force in kg on each charge.
A5.5kg
B7.7kg
C10kg
D2.25kg
#26📜 EE Pre-Board August 2015📘 PowerhouseEasy
The charge on the plates of a 1μF capacitor is 50 μC. What is the energy stored by the capacitor?
A1.25 mJ
B25 mJ
C5.5 mJ
D10.5 mJ
#27📜 EE Pre-Board August 2015📘 PowerhouseEasy
A hollow sphere is charged to 12 μC of electricity. Find the potential inside the sphere. The radius of the sphere is 0.1m.
A\(1.08 \times 10^{7}\) v
B\(1.08 \times 10^{6}\) v
C\(1.08 \times 10^{4}\) v
D\(1.08 \times 10^{2}\) v
#28📜 EE Pre-Board August 2015📘 PowerhouseEasy
Three capacitors are connected in series across a 135 V supply. The voltages across them are 30, 45 and 60 V and the charge on each is 4,500 μC. Find the total capacitance in microfarads.
A33.3
B100
C75
D150
#29📜 EE Pre-Board August 2015📘 PowerhouseEasy
The unit of elastance is
AFarad
BDaraf
CSiemens
DHenry
#30📜 EE Pre-Board March 2016📘 PowerhouseEasy
Two capacitors C1= 50uF and C2= 30uF are connected in series. Find the equivalent capacitance in uF.
A1,875
B187.5
C18.75
D1.875
#31📜 EE Pre-Board March 2016📘 PowerhouseEasy
Three capacitances C1= 6uF, C2= 7uF and C3= 18uF are connected in series across a 120v supply. Find the voltages across C3.
A1.826v
B18.26v
C54.78v
D5.487v
#32📜 EE Pre-Board March 2016📘 PowerhouseEasy
Calculate the capacitance of a parallel plate capacitor having 20 cm x 20 cm square plates separated by a distance of 1 mm. Assume the dielectric medium to be air with permittivity of \(8.85 \times 10^{-12}\) F/m.
A354 μF
B354 pF
C3.54 μF
D3.54 pF
#33📜 EE Pre-Board March 2017📘 PowerhouseEasy
Two capacitors in series are charged across a 24 V source. If \(C_1\) is 12 picofarads and the voltage across it is 6 V, find \(C_2\).
A6 pF
B8 pF
C2 pF
D4 pF
#34📜 EE Pre-Board March 2017📘 PowerhouseEasy
A 40 μF capacitor is supplied with a voltage of \(v(t) = 100\sin 377t\). What is the current at t = 0?
A0
B1.51 A
C3.02 A
D1.07 A
#35📜 EE Pre-Board March 2017📘 PowerhouseEasy
The voltage across a 50 μF capacitor rises at a constant rate of 10 V/ms. Calculate the current through the capacitor.
A50 mA
B500 mA
C5 mA
D5 A
#36📜 EE Pre-Board March 2017📘 PowerhouseEasy
Induced charge on insulators
Aresides on surface
Bmoves inside
Cchanges into electric current
Dmoves outward
#37📜 EE Pre-Board August 2017📘 PowerhouseEasy
Present day capacitors which have high capacitance in small size use a dielectric of
Apaper
Bmica
Cceramic
Dair
#38📜 EE Pre-Board August 2017📘 PowerhouseEasy
Two electrons in a vacuum experience a force of \(2 \times 10^{-15}\) N. How far apart are the electrons?
A\(3.4 \times 10^{-7}\) m
B\(1.15 \times 10^{-13}\) m
C\(3.4 \times 10^{-5}\) m
D\(1.7 \times 10^{-7}\) m
#39📜 EE Pre-Board August 2017📘 PowerhouseEasy
The effect of a dielectric between capacitor plates is to
Areduce the capacitance
Bincrease the capacitance
Creduce the charge stored
Dincrease the plate area
#40📜 EE Pre-Board March 2018📘 PowerhouseEasy
A capacitor is charged with 10,000 μC. If the energy stored is 1 joule, find the capacitance.
A500 μF
B5 μF
C5,000 μF
D50 μF

More Electrical Engineering topics