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Electrostatics

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

📘 EE Mock Board Exam

#21📜 EE Pre-Board March 2015📘 PowerhouseMedium

A 40 μF capacitor is supplied with a voltage of \(v(t) = 100\sin 377t\). Find the current equation.

A\(1.51\sin(377t - 90^\circ)\)

B\(1.51\sin 377t\)

C\(1.51\cos(377t + 90^\circ)\)

D\(1.51\cos 377t\)

#22📜 EE Pre-Board August 2015📘 PowerhouseMedium

A capacitor consists of two metal plates each plates 40 cm x 40 cm, spaced 6 mm apart. The space between the metal plates is filled with a glass plate 5mm thick and layer of paper 1mm thick. The relative permittivities of glass and paper are 8 and 2, respectively. Calculate the capacitance.

A\(118 \times 10^{-11}\) F

B\(122 \times 10^{-11}\) F

C\(126 \times 10^{-11}\) F

D\(130 \times 10^{-11}\) F

#23📜 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

#24📜 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

#25📜 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

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