Quiz 2 Flashcards
(19 cards)
Geophysicists today generally attribute the existence of the Earth’s magnetic field to which of the following?
convection currents within the liquid interior
The quantity of electrical potential, the volt, is dimensionally equivalent to:
force/charge or J/C
Ten coulombs of charge start from the negative terminal of a battery, flow through the battery and then leave through a wire, flow through a resistor and then return to the starting point on this closed circuit. In this complete circuit, the ten coulombs:
have no net change in potential energy
The term magnetic declination refers to which of the following?
angle between directions to true north and magnetic north
Which of the following is not a hard magnetic material?
nickel and cobalt
A soft magnetic material has which property?
It is easy to magnetize
Which voltage is not caused by a source of emf?
the voltage across two copper-iron junctions at different temperatures
A repelling force must occur between two charged objects under which conditions?
Charges are of like signs
Electrical charges and magnetic poles have many similarities, but one difference is:
a magnetic pole cannot be isolated
Which is a unit of power?
W or J/s
The unit of electrical potential, the volt, is dimensionally equivalent to:
J/C
The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning not changed when using the meter):
The internal resistance of an ideal voltmeter is infinite, and the internal resistance of an ideal ammeter is zero.
A free electron is in an electric field. With respect to the field, it experiences a force acting:
anti-parallel (opposite in direction)
Which process will double the power given off by a resistor?
Doubling the current and making the resistance half as big.
The basic function of an electromotive force in a circuit is to do which of the following
convert some other form of energy into electrical energy
The current in an inductor connected to an AC voltage source lags the voltage. This lag is caused by the:
d. back emf in the coil
The power factor in an AC series circuit is equal to which of the following ratios?
ratio of resistance to impedance
Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens?
electrons are added to the rod
When a glass rod is rubbed with silk, which of the following statements best describes what happens?
Electrons are removed from the rod.
