Chapter Questions
What is the charge, $q_1$, on an object that is attracted by a force of $3 \times 10^{-3}$ newtons, to a second charged object with a charge of $q_2=$ $+1.6 \times 10^{-6} \mathrm{C}$, and separated by one millimeter?
A micromachined insulating cantilever beam has a charge at the tip of the beam of $6.5 \mathrm{pC}$. The substrate located 4 microns $(1$ micron $=$ $1 \mu=1 \times 10^{-6}$ meter) under the beam has a mirror charge of $-6.5 \mathrm{pC}$. What is the magnitude of the force pulling down on the tip of the beam?
Two identical point charges each of magnitude $0.03 \mu C$ separated by a distance of $1 \mathrm{~cm}$ experience what magnitude of force between them? Is this force attractive or repulsive?
Assume the radius of a hydrogen atom is $5.3 \times 10^{-9} \mathrm{~cm}$. Calculate the force between the nucleus of the hydrogen atom and an electron at this radius.
Three charges are placed in a straight line as shown in Figure P1.5.FIGURE P1.5 can't copy(a) If $q_1=-2 \mathrm{mC}, q_2=4 \mathrm{mC}$, and $q_3=10 \mathrm{mC}$, find the magnitude and direction of the resultant force on $q_1, q_2$, and $q_3$.(b) If $q_1=-3 \mathrm{mC}$, find the magnitude and sign of the charge $q_3$ such that the resultant force on $q_2$ is zero.
Classify the following as insulators or conductors: iron, glass, rubber, gold, salt water, silver, ceramics, plastic, brass, wood, copper.
For each of the following pairs, identify which is the better electrical conductor: (a) wet aluminum or wet wood, (b) salt water or pure water, (c) copper or iron.
An electric heater operated from a dc source has $8.2 \times 10^{21}$ electrons pass through it in 10 seconds. How much current (in amperes) is flowing through the heater?
If an automobile battery delivers $120 \mathrm{~A}$ when the car is being started, and the starting process takes 6 seconds, how many electrons flow out of the battery?
If $3 \times 10^{19}$ electrons flow uniformly through the cross-section of a wire in $5 \mathrm{~s}$, what is the current flowing through the wire?
Three wires join at a common point or node. The first wire is conducting $3 \mathrm{~A}$ into the node and the second wire is conducting $1 \mathrm{~A}$ away from the node. What is the magnitude of the current in the third wire, and its direction?
Two identical automobile headlamps are connected across a $12 \mathrm{~V}$ battery. If the total current from the battery is measured to be $6.5 \mathrm{~A}$, what is the current through each headlamp?
How many electrons are flowing through the cross-section of a wire per second if a current of 0.2 A flows through it?
What is the typical current range for the following:(a) Large industrial motor(b) Household appliances(c) Lightning bolt(d) Memory cell of an integrated circuit memory
If a battery supplies 3 joule of energy in transferring 0.25 coulombs of charge through an element, what is the voltage across the battery?
A $12 \mathrm{~V}$ lantern battery provides $0.5 \mathrm{~A}$ to operate an electric bulb. During the time of operation of one-half hour,(a) How many electrons pass through the bulb?(b) What is the amount of power delivered to the bulb?(c) How much energy is provided by the battery?
A CRT (cathode ray tube) is used for most television and computer video displays. In the back of a CRT is an electron gun emitting a beam of electrons toward a phosphor-coated display screen; the beam makes a visible spot where it impacts the screen. Assuming the electron gun is made $25 \mathrm{kV}$ more negative than the screen, how much energy is transferred to a single electron by the time it reaches the screen?
One electron-volt $(1 \mathrm{eV})$ is defined as the amount of energy gained by an electron moving through a voltage difference of 1 volt. What is this energy expressed in joules?
A $12 \mathrm{~V}$ car battery delivers $150 \mathrm{~A}$ of current during startup. If it takes one second to start the car, how much energy is supplied by the battery during ignition?
Categorize the following sources of electric power as either ac or dc.1. automobile battery2. solar cell3. residential power outlet4. watch battery5. commercial power generating station6. fuel cell
What is the approximate frequency (in $\mathrm{Hz}$ ) near the center of the portion of the electromagnetic spectrum corresponding to:1. infrared2. shortwave radio3. gamma rays
What is the approximate frequency (in $\mathrm{Hz}$ ) near the center of the portion of the electromagnetic spectrum corresponding to (a) television, (b) ultraviolet light, (c) x-rays?
Assign values to $V$ and $I$ in element $B$ so that it is equivalent to element $A$ (see Figure P1.23).Figure P1.23 can't copy
Assign directions to currents and polarities to voltages in element $B$ so it is equivalent to element $A$ (see Figure P1.24).Figure P1.24 can't copy
In the elements of Figure P1.25, determine for each if they are supplying power or absorbing power and the magnitude of the power being transferred.Figure P1.25 can't copy
In Figure P1.26 determine for each element whether it is supplying or absorbing power. If all the energy absorbed is dissipated as heat, determine the heat dissipated (in joules) over a period of one hour for each of the circuits shown.Figure P1.26 can't copy
A dependent voltage source shown in Figure 1.15 (a) has $\mu=25$. (a) What is the voltage between the terminals on the right, if $v_i=4.3 \mathrm{~V}$ ? (b) If $v_i=30 \mathrm{~V}$ ?
A current-dependent current source has $\beta=30$ and produces an output current of $2 \mathrm{~mA}$. What current is flowing through its input terminals?
What voltage appears at the output of a voltage-dependent voltage source, if $\mu=10^3$ and the voltage applied to the input terminals is $3 \times 10^{-4} \mathrm{~V}$ ?
In the circuit of Figure P1.30, if $\mu=48$, calculate the value of $V_o$.Figure P1.30 can't copy
In the circuit of Figure P1.31, the output voltage, $V_o$, is measured to be 30 volts. Calculate the value of $\mu$.Figure P1.31 can't copy
In the circuit of Figure P1.32, plot the output voltage, $v_o(t)$, as a function of time. Carefully label the axes.Figure P1.32 can't copy
In the circuits of Figure P1.33, a voltage-dependent current source with $g=10^{-3}$ (assume units of volts divided by amperes, or siemens) produces what current through the resistor, $R$ ?Figure P1.33 can't copy
In the circuits of Figure P1.34, a current-dependent current source with $\beta=25$ produces what current through the resistor, $R$ ?Figure P1.34 can't copy