Physics 202 MWF 10:20 Spring 2011 (Ford) Name (printed) Lab Section. Name (signature as on ID) Final Exam Chapters in Young&Geller 8e

__ Physics 202 MWF 10:20 Spring 2011 (Ford) Name (printed) Lab Section Name (signature as on ID) Final Exam Chapters 17-30 in Young&Geller 8e On...
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Physics 202 MWF 10:20

Spring 2011 (Ford)

Name (printed)

Lab Section

Name (signature as on ID) Final Exam Chapters 17-30 in Young&Geller 8e

On the following problems show all your work. Partial credit will be given, if earned. Write your answers in the blanks provided. (12 pts) 1. Consider the capacitor network shown in the sketch. All three capacitors have attained 3 = 4.0 xl 0 F. The charge on capacitor 2 = 3.0 xl 0 F and C 1 = 6.0 xl 0 F, C their final charges. C 1 is Q C 1 = 5.Ox i0 C. Calculate the following

a) Thecharge

2 2 oncapacitor C Q

b) The charge

3 3 on capacitor C Q

c) The battery voltage V

Ms

Ans

Ms

V

,

21 I

IO

B undergoes ,6 decay with a half-life of 0.0174 s. The atomic mass of ‘B (10 pts) 2. The nucleus 1 is l3.017780u. a) What is the total kinetic energy of the decay products, the energy released in this radioactive decay? Refer to the copy of Table 30.2 that is on the formula sheet. Ans

3, L( V\e \)

B nuclei in a sample is 3.2x 1016. How many B nuclei are present in b) At t=0 the number of 1 the sample after 0.0522 s has elapsed?

Ans

‘S

(10 pts) 3. Two large parallel metal plates are separated by 6.0 mm. In the region between the plates there is a uniform magnetic field B = 3.0 T that is directed into the page. A small particle with negative charge q —8.0 xl 0 C is sent into the region between the plates with a speed of 3 mis, as shown in the sketch. A uniform electric field in the region between the plates v = 5.Ox i0 allows the particle to pass through undeflected. 4 e—%4

7c

‘(

x

t

K a) When the particle is between the plates, what are the magnitude and direction of the force that the magnetic field exerts on the particle? AnsF=_________

direction

b) What are the magnitude and direction of the electric field between the plates?

AnsE= direction

5xwNIc

1 is I (10 pts) 4. Consider the circuit shown in the sketch. The current I through resistor R in the direction shown in the sketch. Calculate

=

4.0 A,

-T

I

11z9.O

5OV

2 in the resistor R

Ans

0

3 b) The current 13 in the resistor R

Ans

0 I\

3 c)ThevalueofR

Ans

a) The current

‘2

(10 pts) 5. A plastic film with index of refraction n = 1.85 is put on the surface of a car window to increase the reflectivity and thus to keep the interior of the car cooler. The glass has index of refraction 1.52. What minimum nonzero thickness of plastic is required for light of wavelength 2 = 500 nm in air reflected from the two sides of the plastic film to interfere constructively? Ans

&S4

(o 7,

(8 pts) 6. An object 6.0 mm tall is placed to the left of a converging thin lens that has focal length f = +12.0 cm. The image is 2.0 mm tall and is inverted. Ans

a) Is the image real or virtual? b) Is the image to the left of the lens or to the right of the lens? c) How far is the image from the lens?

d) How far is the object from the lens?

Ms$ Ans

4L

c’i

I

Ans

(0 pts) 7. a) A photon has energy 6.0 eV. What is the linear momentum p of an electron that has the same wavelength as the photon? Express your results in units of kg mis.

Ans . Oyh 4

wj

b) The maximum wavelength of light that will produce photoelectrons from a certain metal surface is 500 nm. What is the maximum kinetic energy of the photoelectrons produced when light of wavelength 400 nm shines on this surface? Express your answer in eV. Ans

Q.)

9 C is on the +x-axis at x = 0.400 m and a positive 1 = —5.0x10 (10 pts) 8. A negative point charge q point charge q 2 +6.0 xl 0 C is on the negative x-axis at x = —0.200 m.



a) What are the magnitude and direction of the resultant electric field at the origin produced by point ? 2 charges q 1 and q

/3f N/Cdirection —v

? 2 1 and q b) What is the total electric potential at the origin produced by charges q Ans

ii

\1

1 = —4.0 xl 0 C is held fixed at the origin and doesn’t move. A (8 pts) 9. A negative point charge q 4 C and mass 2.0x10 4 kgis released from rest on small object with negative charge q 2 =—8.0x10 the x-axis at the point x = 0.50 m. What is the speed of the object when it has moved very far from ? 1 the origin, if the only force on it is the electrical force exerted by q

Ans kwL

(12 pts) 10. a) A conducting bar is pulled to the right with constant speed v on conducting rails, as shown in the sketch. A resistor connecting the other ends of the rails completes the circuit. The entire apparatus is in a uniform magnetic field that is directed out of the page. Is the induced current in the circuit clockwise, counterclockwise or zero?

Ms

nc k .i

e



b) A conducting ring is in a uniform magnetic field that is directed into the page. If the magnitude of the magnetic field is increasing at a constant rate, is the induced current in the ring clockwise, counterclockwise or zero?

Ans

V€(

LlOkW5e

x

c) A long straight wire carries a constant current I in the direction shown in the sketch. A square conducting loop is moving away from the loop at constant speed v. Is the current induced in the loop clockwise, counterclockwise or zero?

1” Ans

/O(kJ1C.

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