Hi,i need a solution for (homework 5 homework 6 and 7)don’t forget to right notes and the used laws, i prefer a pdf file and if hand written try to make it look clear as possibly canthank you

PhysicsII

Sheet#5

Samer Zyoud

Problem1:

A wire made from aluminum (resistivity 2.8 10 8 m
) has a square cross section of side 2

mm. Determine the current in the wire if the electric field
in it is 0.014 N/C.

Problem2:

A 2.0-m long silicon wire which has a rectangular cross
section with width w = 3.2 cm and height

h = 2.5 cm carries a current I = 0.5A when 1.1 V is applied
across its length. If the number

of free charges per unit volume is 1.5×1023 m3,

a)

b)

c)

d)

What is the current density J?

What is the drift velocity vd?

What is the magnitude of the electric field applied to the
wire?

What is the conductivity of the silicon?

Problem3:

The electron density in copper is 8.49 X 1028 electrons/m3.
The electron charge is e = -1.6 X 10-19 C.

Find the electron drift velocity when a 1.00 A current is
present in a copper wire with a 0.4 cm2

cross-section.

Problem4:

A small bulb is rated at 7.5 W when operated at 125 V. The
tungsten filament has a temperature

coefficient f resitivity α = 4.5 X 10-3 / oC. When the
filament is hot and glowing, its temperature is

seven times the room temperature (20 oC). What is the
resistance of the filament (in ohms) at room

temperature?

Problem5:

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PhysicsII

Sheet#5

Samer Zyoud

Problem6:

A wire made from aluminum (resistivity 2.8 10 8 m
) has a square cross section of side 2

mm. Determine the current in the wire if the electric field
in it is 0.014 N/C.

Problem7:

Problem8:

A 10-m length of aluminum wire has a diameter of 1.5 mm. It
carries a current of 12 A. If the density of

aluminum is 2.7 kg/m3 , the molecular mass M = 26.98 x 10-3
kg/mol, and the resistively ρ = 2.8 x 10–8

Ω.m. Assuming that each Al atom contributes with one free
electron. Find (a) The current density. (b)

The drift velocity (c) The electric field in the wire.

Problem9:

Problem10:

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PhysicsII

Problem11:

Problem12:

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Sheet#5

Samer Zyoud

Physics II

Sheet#6

Problem 1

Problem 2

Problem 3

What is the current in the 10-Ω resistor shown in the figure?

+

Ω

−

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Ω

Ω

Samer Zyoud

Physics II

Sheet#6

Samer Zyoud

Problem 4

In the figure, if Є1 = 4.0 V, Є2 = 12.0 V, R1 = 4 Ω, R2 = 12
Ω, C = 3 µF, Q = 18 µC, and I = 2.5 A, what is

the potential difference Va – Vb?

+

−

+

ε

ε

−

−−

++

Problem 5

In an RC circuit, how many time-constants must elapse if an
initially

uncharged capacitor is to reach 80% of its final potential
difference?

Problem 6

In the figure , suppose the switch has been closed for a time
sufficiently long for the

capacitor to become fully charged. Find (a) the steady-state
current in each resistor and

(b) the charge Q on the capacitor and (c) find the time
interval required for the charge on

the capacitor to fall to one-fifth its initial value.

Problem 7

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Physics II

Sheet#6

The ammeter shown in the Figure reads 2.00 A. Find I1, I2,
and

1.

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Samer Zyoud

ε.

Physics II

Sheet#6

Problem 8

In the circuit I = 0.2 A and = 18 V. Determine

a) The current in each resistor.

b) The value of R.

c) The power dissipated in the resistor labeled by 4R.

Problem 9

In the circuit I = 0.5 A and R = 12 . Determine

a) The current in each resistor.

b) The emf .

c) The power dissipated in the resistor labeled by R.

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Samer Zyoud

PhysicsII

Problem1:

Problem2:

Problem3:

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Sheet#7&8

Samer Zyoud

PhysicsII

Sheet#7&8

Samer Zyoud

Problem4:

A magnetic field has a magnitude of 1.2×10-3 T, and an
electric field has a magnitude of 4.6×103 N/C.

Both fields point in the same direction. A positive 1.8 µC
charge moves at a speed of 3.1×106 m/s in a

direction that is perpendicular to both fields. Determine the
magnitude of the net force that acts on the

charge.

Problem5:

A coil of wire has an area of 2×10-4 m 2 , consists of 100
loops or turns, and contains a current of 0.045

A. The coil is placed in a uniform magnetic field of
magnitude 0.15 T. (a) Determine the magnetic

moment of the coil. (b) Find the maximum torque that the
magnetic field can exert on the coil.

Problem6:

A circular area with a radius of 6.5 cm lies in the xy-plane.
What is the magnitude of the magnetic flux

through this circle due to a uniform magnetic field B=0.23 T,
that lies in the (a) +z direction, (b) at an

angle of 53.1o from the +z direction, (c) in the +y
direction.

Problem7:

Problem8:

Problem9:

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PhysicsII

Sheet#7&8

Samer Zyoud

Problem10:

Problem11:

A circular loop of radius R carries a current I2 in a
clockwise direction as shown. The center of the loop is

at a distance D =2R above a long straight wire.

a) Derive an expression for the net magnetic field at the
center of the loop in terms of o, I1, I2 and

R

b) What are the magnitude and direction of the current I1 in
the wire if the magnetic field at the

center is zero?

Problem12:

The conducting rod ab shown in the figure makes contact with
metal rail ca and db. The apparatus is in a

uniform magnetic field of 0.80 T, perpendicular to the plane
of the figure.

a) Find the magnitude of the emf induced in the rod when it
is moving to the right with a speed

of 7.5 m/s.

b) In what direction does the current flow in the rod?

c) If the resistance of the circuit abdc is 1.5 , find
magnitude and direction of the force required

to keep the rod moving to the right with a constant speed of
7.5 m/s.

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PhysicsII

Problem13:

Problem14:

Problem15:

Problem16:

Problem17:

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Sheet#7&8

Samer Zyoud

PhysicsII

Problem18:

Problem19:

Problem20:

Problem21:

Problem22:

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Sheet#7&8

Samer Zyoud

…

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