Q7 Chap 19 Magnetic Field Qualitative

 

            1. The end of a small magnet is its north pole. If we suspend this magnet as a compass, this end will point to

                        A. the earth's rotational geographic north pole

                        B. the earth's rotational geographic south pole

                        C. the earth's  magnetic pole NOT the geographic pole

 

            2.  The lines of force of a bar magnet extend from ___________ pointing toward the ____________ of the bar

                        A. one side of the bar to the other;  middle

                        B. one pole to the other;  north pole

                        C. one pole to the other;  south pole

 

            3. A 0.5A electric current in a straight 0.1m wire goes into the page. Magnetic field lines extend downward on the page with a magnitude of 40T. The force due to the field on the wire is

                        A. to the left

                        B. to the right

                        C. upward on the page

                        D. downward on the page

                        E. out of the page toward you

 

            4.  Use the above question's facts: A 0.5A electric current in a straight 0.1m wire goes into the page. Magnetic field lines extend downward on the page with a magnitude of 40T. The magnitude of the force due to the field on the wire is

                        A. 1 N

                        B. 2 N

                        C. 3 N

                        D. 4 N

                        E. 5


Quiz8 ph102 ch19b. Magnetism (Quantitative)

            1. A 0.5A electric current in a straight 0.1m wire goes into the page. Magnetic field lines extend downward on the page with a magnitude of 40T. The force due to the field on the wire is

                      

                        A. to the left

                        B. to the right

                        C. upward on the page

                        D. downward on the page

                        E. out of the page toward you

 

            2.  A straight wire carries a current of 16A. What is the magnitude of the magnetic field created by this wire at a perpendicular distance of 35cm from the wire?

                        A. 9.1 x 10-6 T

                        B. 8.1 x 10-6 T

                        C. 7.1 x 10-6 T

                        D. 6.1 x 10-6 T

                        E. 5.1 x 10-6 T

 

            3.  Two straight wires which are parallel to one another each carry a current of 16A. The two currents are, however, in opposite directions to one another. What are the directions of the forces on the wires created (ultimately) by these two currents?

                        A. directly towards one another.

                        B. directly away from one another.

                        C. one toward the other but the other away.

                        D. 90 degrees to the line between them.

                        E. in opposite directions but along the directions of the wires.

 

            4.  A long solenoid has 5000 turns per meter and carries a current of 20A. What is the magnetic field inside the solenoid?

                        A. 132T

                        B. 15T

                        C. 1.3T

                        D. 0.126T

                        E. 0.01

 

ph102. q09. ch20.Induced Voltages&Inductance AC

 

   1     A rectangular coil of wire has dimensions 0.24m by 0.18m. A 25T magnetic field passes

         through the coil at an  angle of 15 degrees from perpendicular. What is the magnetic flux

         through the coil?

 

              A   0.28 Wb

              B    0.44 Wb

              C   0.60 Wb

              D   1.04 Wb

              E    1.80 Wb

 

   2     A transformer connected to a 150V ac line is to supply 8,000V to a system. There are 400

         turns in the primary coil of the transformer. The number of turns in the secondary must be

 

              A   21,000

              B    2100

              C   210

              D   21

              E    2

 

   3     A long solenoid has 5000 turns per meter and carries a current of 20A. What is the energy

         density inside the solenoid? Answer in Joules/m3.

 

              A   1327

              B    6283

              C   50000

              D   148

              E    2.5

 

   4     If the magnetic flux changes from 1.04 Wb to zero in a single turn coil in 0.1sec, what is

         the emf generated in volts?

 

              A   100

              B    10

              C   1

              D   0.1

              E    0.001

                                                                                                                            


                                                                                             ph102. q10. ch21a RLC circuits

 

   1     At what frequency will a 12 micro F capacitor have a reactance of XC of 300 Ohms?

 

              A   44 Hz

              B    88 Hz

              C   176 Hz

              D   352 Hz

              E    278 Hz

 

   2     If a series RLC circuit has an impedance of 1000 Ohms and an imposed rms voltage of

         141.4 V, what is the rms current in the circuit?

 

              A   0.141 A

              B    0.282 A

              C   0.564 A

              D   1.128 A

 

   3     What relative values must XL and XC have to obtain the maximum rms I in an RLC series

         circuit?

 

              A   XL = 0.5 XC

              B    XL =  XC

              C   XL = 2 XC

              D   XL = 10 XC

 

   4     An LC circuit is to have resonant oscillations at  5 Hz.  Find the value of a capacitor which

         will work with a 1.0 mH inductor.

 

              A   2 F

              B    1 F

              C   0 F

              D   0.1 F

p102 Q11 ch21b. ElectroMagnetic Waves

            1. Light intensity is in units of W/m2. For a light bulb of 100 W power output, what is the intensity of light on an imaginary sphere of radius 4 m around the bulb.

                        A. 0.5

                        B. 2

                        C. 4

                        D. 8

 

            2.  A light wave between the gamma and x ray types has a frequency of 10^(19) Hz. What is its wavelength?

                        A. 3 x 10 ^(-12) m

                        B. 3 x 10 ^(-11) m

                        C. 3 x 10 ^(-10) m

                        D. 3 x 10 ^(-9) m

 

            3.  Light frequency (f) is mesured in units of ________, wavelength in ______, and they are related to one another by ___________

                        A. Hz;   m;    f=c/wavelength

                        B. m;   Hz;  f=c/wavelength

                        C. Hz;   m;    f=wavelength/c

                        D. Hz;   m;    f=c x wavelength

 

            4. Which of the lists below is in order of increasing wavelength, left to right

                        A. gamma rays;  x-rays; visual; infra-red

                        B. infra-red; visual; x-rays; gamma rays; 

                        C. x-rays; gamma rays;  visual; infra-red

                        D. visual; x-rays; gamma rays;  infra-red

p102  Q12 ch22. WaveNature of Light

 

            1.  Which occurs for light waves but not if light is just particles

                        A. reflection

                        B. transmission through space

                        C. interference

                        D. absorption

 

            2. White light incident on an air/glass interface is split into a spectrum within the glass.  The index of refraction for red light is 1.61 and for blue light 1.67.  Which statement is most accurate?

                        A. Red light is bent downward more (has the greater angle of refraction).

                        B. Blue light has the greater angle of refraction.

                        C. Both have the same angle of refraction.

D. The color with the greater angle  of refraction cannot be determined from the information given.

 

3. Which phenomenon occurs for transverse waves but not for longitudinal waves?

                        A. reflection

                        B. refraction

                        C. diffraction

                        D. polarization

 

            4. When light illuminates two slits, the angle between the central maximum and the first minimum ----------- with increasing wavelength and ----------- with the distance between the slits.

                        A. increase;  increase

                        B. increase;  decrease

                        C. decrease;  increase

                        D. decrease;  decrease

 

            5. Assume two slits 0.002 m apart are illuminated by light.  An interfence pattern is seen 10 m from the slits.  A central maximum is seen on the screen with a minimum 0.015 m from the central maximum.  What is the wavelength of the light?

                        A. 2.5x10^(-5) m

                        B. 1.2x10^(-5) m

                        C. 6x10^(-6) m

                        D. 1 x10^(-6) m

Quiz 13  ph102 ch23. Light&Geometric Optics

 

            1. A real object is placed 10 cm from a converging lens that has a focal length of 6cm. Which statement is most accurate?

                        A. The image is real, erect, and enlarged.

                        B. The image is real, inverted, and enlarged.

                        C. The image is real, erect, and reduced.

                        D. The image is real, inverted, and reduced.

 

            2. What is the focal length of a lens that forms a virtual image 30cm from the lens when a real object is placed 15cm from the lens?

                        A. 10 cm

                        B. 15 cm

                        C. 30 cm

                        D. 45 cm

 

            3. What is the magnification of a lens that forms an image 20 cm to its right when a real object is placed 10 cm to its left?

                        A. 0.50

                        B. 1.0

                        C. 1.5

                        D. -2.

 

            4. The index of refraction for water is 1.33 and that for glass is 1.50. A light ray strikes the water/glass boundary with an incident angle of 30.0o on the water side. Which statement is most likely true for its refracted angle in the glass?

                        A. The angle of refraction is 26.30.

                        B. The angle of refraction is 34.70.

                        C. The angle of refraction is 30.00.

                        D. The angle of refraction is 60.00