Chapter 26
26.1. During the 4.0 min a 5.0 A current is set up in a wire, how many (a) Coulombs and (b)
electrons pass through any cross section across the wires width
q = i t = 5.0 A 240 s = 1200C
q = n e
q
1200C
n=
=
= 7.5 10 21 electrons
e 1.6 1019 C
26
Chapter 30
30.1 In Fig. 30-37, the magnetic ux through the loop increases according to the relation
B = 6.0 t 2 + 7.0 t where the ux is in milliWebers and t is in seconds. (a) What is the
magnitude of the emf induced in the loop at t=2.0s? (b) In what dir
Chapter 27
27.2 A certain car battery with 12.0 V emf has an initial carge of 120 A h. Assuming that the
potential across the terminals stays constant until the battery is completely discharged, for how
many hours can it deliver energy at a the rate of 10
Chapter 32
32.9 Uniform electric ux. Figure 32-30 shows a circular region of radius R=3.00 cm in which
a uniform electric ux is directed out of the plane of the page. The total electric ux through the
region is given by UE = (3.0 mV $ m/s) t , where t is
Chapter 31
31.8 LC oscillators have been used in circuits connected to create some of the sounds of
electronic music. What inductance must be used with a 6.7F capacitor to produce a frequency
of 10 kHz which is near the middle of the audible range of freq
Chapter 23 Problems
23.1 The square surface shown in Fig 23-26 measures 3.2 mm on each side. It is immersed in a
uniform electric eld with magnitude E = 1800 N/C. The eld lines make an angle of 35 degrees
with a normal to the surface as shown. Take the no
Chapter 25
25.2 The capacitor in Fig. 25-26 has a capacitance of 25nF and is initially uncharged. The
battery provides a potential difference of 120 V. After switch S is closed, how much charge will
pass through it.
This question is really asking what the
Chapter 28
28.1 An electron that has velocity
v = (2.0 10 6 m / s) i + (3.0 10 6 m / s)
j
moves through a uniform magnetic eld
B = (0.030T ) i (0.15T )
j
(a) Find the force on the electron. (b) Repeat your calculation for a proton having the same
veloci
Chapter 22
22.3 What is the magnitude of a point charge whose electric eld 50 cm away has the
magnitude of 2.00N/C.
q
E=
4 0 r 2
q = 4 0 r 2 E
= 5.56 10 11 C
22.5 An atom of plutonium-239 has a nuclear radius of 6.64 fm and atomic number Z=94.
Assuming th
Chapter 24
24.2 The electric potential difference between the ground and a cloud n a particular
9
thunderstorm is 1.2 10 V . In the unit electron volts, what is the magnitude of the change in the
electric potential energy of an electron that moves between
Chapter 21
6
21.1 What must the distance between point charge q1 = 26 10 C and point charge
q2 = 47 10 6 C for the electrostatic force between them to be 5.70N?
The magnitude of the force of attraction is given by Coulombs law where we have taken the
abso
Chapter 29
29.5 In Fig. 29-36, two circular arcs have radii a = 13.5cm and b = 10.7cm , subtend angle
= 74, carry current i = 0.411A , and share the same center of curvature P. What are (a) the
magnitude and (b direction of the net eld at P.
This is exac