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. May 2016

AC

Q1- What is the maximum current in a 2.20-micro-farade capacitor when it is connected across

a) A North American electrical outlet having Vrms = 120 V, f = 60.0 Hz,

b) A European electrical outlet having vrms = 240 V, f = 50.0 Hz?

Solution:

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WPE

(On request - David)

Q- A pile driver of mass 273 KG is allowed to fall through a height of 4 m on a 667 kg steel pile to drive it into the ground. Each impact drives the pile into the ground by 109mm. Assuming that the pile driver remains in contact with the pile after impact, calculate the averag…

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Electromagnetic Waves

Q- Write down expression for the electric and magnetic fields of a sinusoidal plane electromagnetic wave having a frequency of 3.00 GHz and traveling in the positive x- direction. The amplitude of the electric field is 300 V/m.

Solution:

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Standing Wave on String

Q1- Standing waves of frequency 180 Hz are produced on a string of length 60 cm and it vibrates making three loops. What is the wave speed on the string?  

Q2- A 121 cm long string with mass 4.0 g oscillates in its m=3 mode with a frequency of 180 Hz and a maximum amplitude of 5.0 mm. What are (a)…

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Current Electricity

Q- Four resistors (R1 = 60 Ohms, R2 = 220 Ohms, R3 = 330 Ohms, and R4 = 480 Ohms), an ideal inductor (L = 8 mH), and a capacitor (C = 250 µF) are connected to a battery (V = 9V) through a switch as shown in the figure below. What is Ustored, the total stored energy in the circuit elements (not incl…

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Friction

Q- A small coin is placed on the horizontal surface of a rotating disk at a distance r from the center. The disk starts from rest and is given a constant angular acceleration α. The coefficient of static friction between the coin and the disk is µs. Determine the number of revolution N through the…

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