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Physics Assignment Solutions (Spring 2012) - Topics: Magnetic Fields, Electric Charge, Exercises of Physics

Aliah UniversityPhysics

Solutions to assignment 3 for the physics 101 course offered in spring 2012. The assignment covers topics such as magnetic field strength and direction, emf induction, and charge densities. Students will find detailed solutions for three questions, including proofs and formulas.

Typology: Exercises

2011/2012

Uploaded on 08/03/2012

lakshmicunt
lakshmicunt 🇮🇳

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Solution Assignment 3: (Spring 2012) Physics
PHYSICS (PHY101)
TOTAL MARKS: 20
Due Date: 14/06/2012
Q # 1
What is the magnetic field strength and direction at point C, shown in above figure?
Marks = 6
Solution
7
6
2
(4 10 )(3.00)
2 (0.150)
4.0 10
int int int
oI
BR
B
T
Field po s o screen at po C
µ
π
π
π
−
−
=
×
=
=×
Q # 2
Is it true or false that any magnetic field induces an emf in a loop of wire? If true give a
proof, if false explain it. Marks = 4
Solution
No, only a changing magnetic field induces an emf in such a loop. A uniform, constant
magnetic field alone induces no net emf in a loop of wire. However, a potential
difference can be induced across a segment of wire by moving it through a magnetic
field.
Question # 3
Differentiate among linear charge density, surface charge density and volume charge
density. Marks = 5
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Download Physics Assignment Solutions (Spring 2012) - Topics: Magnetic Fields, Electric Charge and more Exercises Physics in PDF only on Docsity!

Solution Assignment 3: (Spring 2012) Physics

PHYSICS (PHY101)

TOTAL MARKS: 20

Due Date: 14/06/ Q # 1

What is the magnetic field strength and direction at point C, shown in above figure? Marks = 6

Solution

7

6

int int int

B o^ I R

B

T

Field po s o screen at po C

−

−

×

= ×

Q # 2

Is it true or false that any magnetic field induces an emf in a loop of wire? If true give a proof, if false explain it. Marks = 4

Solution

No, only a changing magnetic field induces an emf in such a loop. A uniform, constant magnetic field alone induces no net emf in a loop of wire. However, a potential difference can be induced across a segment of wire by moving it through a magnetic field.

Question # 3

Differentiate among linear charge density, surface charge density and volume charge density. Marks = 5

Solution

The linear, surface, or volume charge density is the amount of electric charge in a line, surface, or volume, respectively. It is measured in coulombs per meter (C/m), square meter (C/m²), or cubic meter (C/m³), respectively,

Linear charge density:

Linear charge density for a uniformly charged line of length L and total charge Q , the linear charge density is given by Q L

Surface charge density:

Surface charge density for a uniformly charged plane of area A and total charge Q , the surface charge density is given by

Q

L

Volume charge density:

Volume charge density for a uniformly charged space of volume V and total charge Q , the volume charge density is given by Q L

Question # 4

During brushing your hairs results in electrons being removed from your hairs and deposited on the hairbrush. Which of the following statement is false? Marks = 5

a) After brushing, your hair has a positive charge. b) After brushing, hairbrush has a negative charge. c) After brushing, your hair is attracted by the hairbrush. d) The process of brushing causes the destruction of electrons in your hairs. e) The number of electrons removed from your hairs is equal to the number of electrons deposited on the brush.

Write the reason of your above selected choice as well.