Physics 2 true and false

Question 1

If you place a proton directly on top of an electron, the net charge of the system is zero (q1)

Answer 1

True

Question 2

In insulated materials, electrons are tightly bound to atoms and are not free to move (q1)

Answer 2

True

Question 3

Assuming electrons begin to drift to the right, the current points to the left (q5)

Answer 3

True

Current is direction of positive charges

Question 4

The drift velocity of the electrons in the wire is extremely high (q5)

Answer 4

False

SLOW!

Question 5

Good conductors have high resistivity (q5)

Answer 5

False

high resistivity=insulator

Question 6

Equivalent resistance of parallel resistors is always less than either resistor (Q6)

Answer 6

True

Add in series!

Question 7

DIAGRAM FOR CAPACITOR (q6)

Answer 7

KNOW! :)

Question 8

Moving magnets near coils of wire can cause charges in those coils to move. (q8)

Answer 8

True

Electromagnitism!

Question 9

Moving coils of wire near magnets does not cause the charges in the coil to move ( q8)

Answer 9

False

Magnets near wires moving are always creating charge movement

Question 10

A coil of wire sits in a constant, uniform magnetic field. There is a current in the wire (q8).

Answer 10

False

if the magnetic field is constant, no current.

Question 11

An inductor and a solenoid are virtually identical (q8)

Answer 11

True

Same thing :)

Question 12

When potential is applied to an inductor, the effect of the inductor is to slow down the charge in current through the inductor (q9)

Answer 12

True

Back EMF

Question 13

The RMS voltage is greater than the peak voltage (q9)

Answer 13

False

RMS is the root mean squared AVERAGE! peak is just that: a peak.

Question 14

The current in a resistor is out of phase with the applied AC voltage (q9)

Answer 14

False

Resistor is IN PHASE!!!

Question 15

The displacement current between the plates of a capacitor is caused by charges flowing across the plates. (q10)

Answer 15

False

No charges flow directly across the plate

Question 16

All electromagnetic phenomena can be described with Maxwell’s Equations (q10)

Answer 16

True

Question 17

X-Rays have longer wavelengths than visible light (q10)

Answer 17

False

Question 18

A diverging lens always produces a real image of an object placed in front of it. (q12)

Answer 18

False

True for convex

Question 19

For an upright image, the magnification is positive; for an inverted image, the magnification is negative. (q12)

Answer 19

True

Question 20

The Ray Model of Light correctly predicts double-Slit Interference (q13)

Answer 20

False

Because geometry doesn’t work in this scenario

Question 21

The diffraction of light limits the ability to see small or distance objects. (q13)

Answer 21

True

Question 22

Electric forces always point parallel to the dirrection of the electric field (t1)

Answer 22

True

Question 23

Voltage is a measure of potential energy (t1)

Answer 23

False

FIGURE IT OUT

Question 24

If the total flux through a closed surface is zero, then no electric field exists within the surface (t1)

Answer 24

False

No electric field is founded within the surface

Question 25

In a parallel plate capacitor, you can think of the energy as being stored in the electric field between the plates (t1)

Answer 25

True

Question 26

The electric field inside a charged conductor in equilibrium is zero (t1)

Answer 26

True

Question 27

Doubling the radius of the conducting wire increases its resistance (q1)

Answer 27

False | Inversely related meaning increased cross-section=decreased resistivity.

Question 28

In typical Materials, heating them up reduces their resistance to charge flow (q1)

Answer 28

False | particles move faster taking up more space.

Question 29

A single solenoid carrying a current will store magnetic energy (t2)

Answer 29

True | Back EMF caused by magnetism [right hand rule!]

Question 30

Transformers allow one to change the voltage delivered by an AC supply (t2)

Answer 30

True | ratio of turns to voltage

Question 31

An RC circuit can be used to create radio waves of a specific frequency (t2)

Answer 31

False | must also have an inductor

Question 32

The Poynting vector points in the direction of motion of the E-M Wave (t2)

Answer 32

True

Question 33

The Resistance of two parallel resistors is always more than their sum (t2)

Answer 33

False

Question 34

A stationary electron in a strong magnetic field will experience acceleration (t2)

Answer 34

False | Only if it already in motion.

Question 35

Light travels more slowly in glass than air (t3)

Answer 35

True

Question 36

Light is focused most effectively by spherical mirrors (t3)

Answer 36

False | Parabolic

Question 37

Dispersion describes the separation of light's colors by refraction

Answer 37

True

Question 38

Light rays entering the human eye are primarily bent through refraction into the vitreous humor (the liquid) [t3]

Answer 38

TRUE | Practice test is misleading!

Question 39

Images are always smaller in convex mirrors

Answer 39

True

Question 40

Astigmatism describes the aberration caused by different wavelengths focusing to different points. (t3)

Answer 40

False | Different radii of spheres. Differing wavelenths is chromatic

Question 41

Refraction describes the process of light reflecting off a smooth surface (t3)

Answer 41

False | Reflection is reflecting, refraction is going through

Question 42

Frequency is unchanged by the medium in which light travels

Answer 42

True | wavelength and speed can change

Question 43

Two lightbulbs a distance apart will form a pair of coherent light sources (t3)

Answer 43

False | Hard to get coherent light (ex. lasers)

Question 44

The diffraction of light limits the ability to see small or distant objects

Answer 44

True

Question 45

It is possible for light to experience total transmission as it is incident on glass from Vacuum

Answer 45

False | All light reflects at least a little bit.

Question 46

Lateral magnification is m=0.5

Answer 46

False | for flat mirrors m=1

Question 47

A diffraction grating of 100 slits has greater resolving power than a double-slit grating

Answer 47

True | more is better!

Question 48

Maxwell claimed that a current is created between the plates of a capacitor by the changing magnetic field

Answer 48

False | Displacement current is created by changing electric fields.

Question 49

two Wires will be drawn together if they are carrying current in the same direction

Answer 49

True | Right hang rule

Question 50

Typical resistors are limited in how much current they can conduct

Answer 50

True | Resistors can burn out!

Question 51

Transformers allow one to change the voltage delivered by an AC supply.

Answer 51

True | Ratio of coils for voltage change.