final exam multiple choice Flashcards
e- initially moving to right and enters an electric field directed up, which pathway will it follow?
trajectory z (bottom one)
which of the following increases the capacitance of a parallel plate capacitor
-decrease the separation between plates
-add dielectric material between
an ideal parallel plate capacitor has capacitance C. what happens if the distance between plates is halved and area is doubled
4C
when a current flows through an ionic liquid such as salty water the moving charges are
both positive and negative ions
battery charges a parallel plate capacitor fully and is then removed, the plates are then slowly pulled apart, what happens to the potential difference as they are being separated
it decreases
you are given a copper bar of dimensions of 3cmx5cmx8cm and asked to attach leads, to achieve smallest resistance you attach leads to
3cm x 5cm
as more resistors are added in series to constant voltage the power supplied by the source…
increases
charged particle entered into a uniform mag field where velocity is perpendicular to the mag field lines, the particle will
follow a circular path
a horizontal wire carries a current straight towards you, from your pov the mag field caused by the current…
circles the wire in a counter-clockwise direction
in the figure the bar magnet moves away from the solenoid, direction of the induced current through the resistor is
from a to b
in the figure one end of a metal bar is in contact with circular rail, mag field is present, when bar rotates in clockwise direction the induced current in the resistor is from
b to a
in double slit interference…. greates seperation between the slits you would use
red light
a single-slit diffraction pattern is formed on distant screen, assuming the angles are small, what factor will the central bright spot change if the wavelength is doubled
it will double
when a beam of light travels in air and enters glass having a refractive index of 3/2, its wavelength
is reduced to 2/3 its original value
convex lens has a focal length f if an object located at infinity, the image formed is located at a distance from the lens
of f
the image formed by a single concave lens
is always real
a critical angle for a beam of light passing from water into air is air 48.8 degrees this means that all light rays with an angle of incidence in the water is greater than 48.8 will be
totally reflected
which of the following terms describes lenses that are thicker at the center than at the edges
converging, convex lens
which of the follwoing statements about the image formed by a single diverging lens are true
-always virtual
-always upright
a negative magnification for a mirror means that
the image is inverted and the mirror is concave
single concave spherical mirrors produce images that
could be smaller, larger, or the same size depending on the placement of the object
infared and x ryas have different
frequencies and wavelengths
addition of two waves producing a stronger wave is called
constructive interference
shine laser through a double slit, what would you so to increase the distance
-move slits further from wall
-decrease spacing between slits
-use a longer wavelength
radioactive decay from most to least dangerous
gamma, beta -, beta +, alpha
weakest nuclear force is the
gravitational force
plastic rod given a negative charge by rubbing the right end with wool, the negative charge in the rod is…
evenly distributed
the job of a bettery is to provide
constant voltage
if the rod that was rubbed with wool is now held near a conductive sphere that is grouneded, the sphere has a ______ charge
positive
a proton is released from rest in a uniform electric field, the proton ill move….
in the same direction as the field
the protons kinetic energy will _____ and its electric potential will ______ when proton is released in a uniform electric field.
increase, decrease
the mag force on a current carrying wire in a mag field is always ______ to the current and _____ to the mag field
perpendicular, perpendicular
compared to the force on the electron, the magnitude of the magnetic force on the proton is ______, and the direction of the mag force on the proton is _____-
the same, opposite
the particles will both travel in circular paths, the radius of the protons path will be _____ the radius of the electrons path
greater than
if two light bulbs are wired in series what to the current if one bulb burns out
there will be no current
metal bar in contact with parallel rails and the direction of the induced current is
no current is induced
