Ch 6 physics
The wire has no tendency to move or turn
A current carrying wire is in a magnetic fueld with the direction of the current perpendicular to that of the field
East
A current is flowing south along a power line. Neglecting earths field, the direction of the magnetic field under the power line is
Both the direction and the strength of the field
A drawing of the field lines of ms magnetic field provides information on
A stationary electric charge
A magnet dies not exert force on
Transformers
Direct electric current cannot be used to operate
Are SOME distance away from the nucleus
The electrons in an atom
Potential difference
The volt is the unit if electric
V x A= w
The watt the unit of power is equal to the
p/4
When the voltage across a certain resistance is V, the power delivered is P. If the voltage is doubled to v/2 the power delivered becomes
Protons and electrons have equal masses
Which of the following is not true
Moving electrons constitute electric currents
Which of the following statements is correct
A proton in an atom circulates around its nucleus
Which of the following statements is not true
Positive ion
A molecule that has lost an electron
It has a deficiency of electrons
An object has a positive charge whenever
Electrically Neutral
Atoms and molecules are Normally
Will continue indefinitely
If UNDISTURBED an electric current in a superconducting wire loop
A negative electric charge
Interacts with both positive and negative charges
Electric charge
Occurs only in separate parcels of +- 1.6 x 10-19 C
Holds only for metals
Ohms law
Weaker
Relative to the electric force between two protons, the GRAVITATIONAL force between them is
Only at very low temperatures
Super conductivity occurs in certain substances
Electric charge
The conventional unit of BATTERY capacity is the ampere-hour,nwhoch is actually a unit of
Must be AC
The current with which a transformer us used
Energy (think lightbulb)
The kilowatthour is a unit of
Contains most of the atoms mass
The nucleus of the atom
Parallel to the field
Urgent carrying loop in a magnetic field always tends to turn until the plane of the loop is
Becomes heat
When a current passes through resistance, the electric energy that is lost
Becomes weaker
When a magnetized iron bar is strongly heated, it's magnetic field
Is the same under all circumstances
Coulombs formula f=kq1q2/r2 gives the force between two charges in free space. the value K
