Electrostatics
What term is used for electricity at rest?
electrostatics is the term for electrostatics at rest.
Which part of an atom is positevely charged, and which part is negatively charged?
the nucleus and its protons are positively charged, the electrons are negatively charged.
Why are electrons, rather than protons, the principal charge carries in metal wires?
electrons are free to wander, whereas protons are imbedded in atomic nuclei, not free to roam.
Name two kinds of practical "electric pumps"
one kind is a battery, another is generator
What is the source of magnetic force?
Moving electrons are the source of magnetic force
What is most commonly the net charge of an atom?
the normal net charge is zero
what is meant by conservation of charge?
means that charge cannot be created or destroyed, but merely transferred
Does electric charge flow across a circuit or through a circuit?
electric charge flows through a circuit
Does voltage flow across a circuit or is it impressed across a circuit?
voltage doesn´t flow at all but is impressed across a circuit.
In what way are magnetic poles very different from electric charges?
magnetic poles cannot be isolated, electric charges can
Name one particle that has exactly one quantum unit of charge?
an electron (or proton) has exaclty one quantum of unit charge
How is Coulomb´s law similar to Newton´s law of gravitation? How is it different?
both law´s are inverse-square laws. The main difference is that gravitation is only attractive, whereas electrical forces can repel
How does wetness affect the resistance of your body?
wetness lowers your body´s electrical resistance
Does a battery produce dc or ac? Does a generator at a power station produce ac or dc?
a battery produces dc. a generator normally produces ac
What produces a magnetic field?
the motion of electric charges produces a magnetic field.
What happens to electrons in any charging process?
electrons are transferred from one place to another
What is a transitor composed of, and what are some of its functions?
is composed of thin layers of semiconducting materials. Its functions include controlling the flow of electrons, amplifying signals, and acting as a switch.
What is the error in saying that the source of electrons in a circuit is the battery or generator?
the error is that the source is the conducting wires themselves, not the power source.
From where do the electrons originate that produce an electric shock when you touch a charged conductor?
when you are shocked, your own body is the source of electrons, but not the source of the energy imparted to them.
How the magnetic, direction, and current of a straight wire affect its magnetic field?
its magnetic field is directly proportional to the magnitude of the current.
What kind of charging occurs during thunderstorms?
charging by induction occurs during thunderstorms
When charges mutually repel and distribute themselves on the surface of conductors, what becomes of the electric field inside the conductor?
the electric field inside a conductor cancels to zero
In a circuit of two lamps in series, if the current through one lamp is 1 A, what is the current through the other lamp?
the current is 1A everywhere in two lamps connected in series
In a circuit of two lamps in parallel, if there is a voltage of 6V across one lamp, what is the voltage across the other lamp?
both lamps have 6 volts across them when connected in parallel
In what direction relative to a magnetic field does a charged particle move in order to experience maximum deflecting force? minimum deflecting force?
Force is maximum when motion is perpendicular to the field. Minimum when parallel to the field.