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VU of Pakistan
Assignment 3: (Spring 2013)
TOTAL MARKS: 30
Due Date: 01/07/2013
DON’T MISS THESE Important instructions:
• To solve this assignment, you should have good command over first 28 lectures.
• Upload assignments (Microsoft word) properly through LMS, (No Assignment will be
accepted through email).
• Write your ID on the top of your solution file.
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internet or any other source.
• Use Math Type or Equation Editor etc for mathematical symbols.
• This is not a group assignment, it is an individual assignment so be careful and avoid
copying others’ work. If some assignment is found to be copy of some other, both will be
awarded zero marks. It also suggests you to keep your assignment safe from others. No
excuse will be accepted by anyone if found to be copying or letting others copy.
Don’t wait for the last date to submit your assignment.
Question # 1
Two charged spheres are held a distance, r, apart. One sphere has a charge of +4μC, and the other sphere has a
charge of +8μC. Compare the force of the +4μC sphere on the +8μC sphere with the force of the +8μC sphere
on the +4μC sphere. (Note: Answer should not be greater than a one line). Marks = 5
Question # 2
I. When do you wipe a compact disc with a clean cloth, why does the CD begin to attract
II. The constant, K, in Coulomb’s equation is much larger than the constant, G, in the
universal gravitation equation. Of what significance is this? Marks = 5 (2+3)
Question # 3
I. A positive charge of 5.0×10-7 C is located in a field of 30 N/C directed toward the south.
What is the force acting on the charge?
II. How is the direction of an electric field defined?
III. Why can birds perch on high voltage lines without being injured? Marks = 9 (5+2+2)
Physics (PHY101) VU of Pakistan
Question # 4
Jamil and Salma are standing on an insulating platform and holding hands when they are given a
charge, as in Figure Jamil is larger than Salma. Who has the larger amount of charge, or do they
both have the same amount? Marks = 4
Question # 5
The circuit above shows two 1.5V batteries connected so that the current flows through the three
light bulbs which have 10 Ω, 5Ω and 15 Ω resistances as shown. In this circuit:
a. Electrons flow clockwise through the circuit.
b. The flow of current is greatest, through the 5 Ω resistor.
c. The light bulbs have different voltages over them.
d. The flow of current is least, through the 5 Ω resistor.
e. The batteries and light bulbs are connected in parallels.
Note: Explain the reason of your above selected choice as well.
Marks = 7(3+4)
<Wish you good luck>>>>>>>>>>>>
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n@z read the statement in your referred link,
In the series circuit, any current that flows through one bulb must go through the other bulbs as well, so each bulb draws the same current. Since all three bulbs are 40-watt bulbs, they have the same resistance.
here resistance is different. where there is less resistance, flow of current will be greater, and where resistance is most flow of current will be the least. b is the right option.
Q1. electric field intensity is zero at some point on the line joining the two charges.
write in your own understanding to avoid marks deduction.
ThankX to All