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Physics 152
Final Exam
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(Name)
1.
Find the force on a charge on q1 = 4x10-6coulombs at the apex
of an equilateral triangle with -6sides of 20 cm. if the
other two
corners are occupied by q2=+3x10 coulombs and q3=-5x10-6coulombs
respectively. (Specify magnitude and direction). The base of the
triangle is the x axis.
2.
A capacitor is made from two parallel square plates, 10 cm
on a side, separated by 5x10-3 meters. If the potential difference
between the plates is 500 volts, find the electric field and the
charge on each plate.
3.
An electron is several meters from a Helium
nucleus(effectively at infinity)
and is released. If no other-10forces act on the electron, what is
meters from the Helium.
its velocity when it is 1x10
4.
A proton is accelerated through 25,000 volts potential
difference and then enters a region of magnetic field. The field
is perpendicular to the velocity of the proton. The proton is
moving from left to right as shown and bends up through a
circular arc of radius 1.5 cm. What is the magnitude and
direction of the magnetic field?
5.
Given the circuit shown, find the current in the 3 olm
resistance.
Use any practice circuit in book
6.
If two loops of wire are concentric as shown and a current
is abruptly turned on in the outer loop, show the direction of
the current in the inner one.
This is just two circles, one inside the other. Try with both
clockwise and counterclockwise, turning on and turning off.
7.
Two lenses are separated by 20 cm. The first lens is a
positive lens, f=12 cm., the second one is a negative one, f=-15
cm. Find and describe the final image.
8.
If a light source is in a media with n=1.65, at what minimum
angle must it strike an interface with water (n=1.33) in order
that total internal reflection occurs.
9.
A thin film of oil (n=1.25 is compressed between two glass
microscope slides(n=1.5). The whole thing is observed from above
(in air) and the color of light that is reflected back most
strongly is a mixture of 550 and 367 nannometer light. Find the
thickness of the film.
10. A spaceship ventures to a star and back, a total distance of
25 light years (as measured before he begins the trip). When he
returns his brother has aged 30 years. How much has the traveler
aged?
11.
Find the energy for transitions involving levels up from n=1
to n=4 doubly ionized lithium.
12. Write the equation and find the energy released in the α
226
decay of 88 Ra.
13.
Find the binding energy and the binding energy for
56
26
Fe .
14. A light source consists of three wavelengths, 400nm, 500nm
and an unknown one. When the light is shined on a diffraction
grating it forms a pattern on the wall 1 meter from the grating.
It is found that the 400nm line's 1st order maxima is 10.5 cm
from the central max. what is the number of lines per cm. of the
grating?