Electrostatics Practice Questions with Solutions – Electrical Engineering (Page 4)

#61📜 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

#62📜 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

#63📜 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

#64📜 EE Pre-Board March 2017📘 PowerhouseMedium

Assuming a certain driving voltage causes the current to an initially discharged 1,000 μF capacitor to increase at a constant rate of 0.06 A/s, determine the voltage across the capacitor at t = 10 seconds.

A600 v

B1,500 v

C2,000 v

D3,000 v

#65📜 EE Pre-Board March 2017📘 PowerhouseEasy

Induced charge on insulators

Aresides on surface

Bmoves inside

Cchanges into electric current

Dmoves outward

#66📜 EE Pre-Board August 2017📘 PowerhouseEasy

Present day capacitors which have high capacitance in small size use a dielectric of

Apaper

Bmica

Cceramic

Dair

#67📜 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

#68📜 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

#69📜 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

#70📜 EE Pre-Board March 2018📘 PowerhouseMedium

What is the force on a \(+5 \times 10^{-11}\) C charge that is 5 cm from each of two \(+2 \times 10^{-9}\) C charges that are separated by 8 cm?

A\(0.432 \times 10^{-6}\) N

Bzero

C\(0.36 \times 10^{-6}\) N

D\(0.14 \times 10^{-6}\) N

#71📜 EE Pre-Board March 2018📘 PowerhouseEasy

The voltage across a 50-μF capacitor rises at a constant rate of 10 V/ms. Calculate the current through the capacitor.

A2 mA

B5 mA

C50 mA

D500 mA

#72📜 EE Pre-Board March 2018📘 PowerhouseEasy

Two equally charged spheres repel each other with a force of 0.1kg. If their centers are 20 cm apart, find the charge on each.

A\(2.09 \times 10^{-6}\) C

B\(2.09 \times 10^{6}\) C

C\(2.00 \times 10^{-6}\) C

D\(2.00 \times 10^{6}\) C

#73📜 EE Pre-Board March 2018📘 PowerhouseEasy

The area of one plate of a two-plate mica capacitor is 0.0025 m² and the separation between plates is 0.02 m. If the dielectric constant of mica is 5, what is the capacitance of the capacitor?

A5.53 μF

B5.53 pF

C7.74 μF

D7.74 pF

#74📜 EE Pre-Board August 2018📘 PowerhouseMedium

An equal number of electrons is placed on two metal spheres 3cm apart in air. How many electrons are on each sphere if the resultant force is 4kN?

A\(1.47 \times 10^{14}\) electrons

B\(1.33 \times 10^{14}\) electrons

C\(1.25 \times 10^{14}\) electrons

D\(1.40 \times 10^{14}\) electrons

#75📜 EE Pre-Board August 2018📘 PowerhouseEasy

A capacitor is charged with 10,000 μC. If the energy stored is 1 joule. Find the capacitance

A5μF

B50μF

C500μF

D5,000μF

#76📜 EE Pre-Board August 2018📘 PowerhouseEasy

Inside a hollow spherical conductor

Aelectric field is zero

Belectric field is constant

Celectric field changes with distance from the center of the sphere

Delectric field is unity

#77📘 EE Pocket Reviewer RojasEasy

The unit “ampere-second” is a unit of which of the following?

ACharge

BPower

CCurrent

DEnergy

#78📘 EE Pocket Reviewer RojasEasy

Which of the following parameters, will not affect the capacitance of the capacitor?

AThickness of the plates

BNature of dielectric

CArea of the plates

DDistance between the plates

#79📘 EE Pocket Reviewer RojasEasy

What is the SI unit of capacitance?

ACoulomb

BHenry

COhm

DFarad

#80📘 EE Pocket Reviewer RojasEasy

What is the reciprocal of capacitance?

ADaraf

BPermeance

CElastance

DSusceptance

More Electrical Engineering topics