Ch 6 physics

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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


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