1E03Review2009 - Physics 1E03 review session Brought to you...

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Unformatted text preview: Physics 1E03 review session Brought to you by your TAs Marcel, Yannick, Phil and Katharina Electrostatics • Electric fields (Ch 23) • Gauss’s law (Ch 24.1-24.4) • Electric Potential (Ch 25.1-25.6) A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is: A) 0 B) a √ C) 2a D) a/√ 2 E) a/ 2 Positive charge Q is distributed uniformly throughout an insulating sphere of radius R, centered at the origin. A particle with positive charge Q is placed at x = 2R on the x axis. The magnitude of the electric field at x = R/2 on the x axis is: A) Q/4π ²0 R2 B) Q/8π ²0 R2 C) Q/72π ²0 R2 D) 17Q/72π ²0 R2 E) None of these A charged point particle is placed at the center of a spherical Gaussian surface. The electric flux ΦE is changed if: A) The sphere is replaced by a cube of the same volume B) The sphere is replaced by a cube of one-tenth the volume C) The point charge is moved off center (but still in the original sphere) D) The point charge is moved to just outside the sphere E) A second point charge is placed just outside the sphere A solid insulating sphere of radius R contains positive charge that is distributed with a volume charge density that does not depend on angle but does increase with distance from the sphere center. Which of the graphs below might give the magnitude E of the electric field as a function of the distance r from the center of the sphere? Charge is distributed uniformly on the surface of a large flat plate. The electric field 2 cm from the plate is 30 N/C. The electric field 4 cm from the plate is: A) 120 N/C B) 80 N/C C) 30 N/C D) 15 N/C E) 7.5 N/C DC circuits • Capacitance (Ch 26.1-26.5) • Current & Resistance (Ch 27.1-27.3, 27.6) • DC circuits, Kirchhoff’s rules (Ch 28.1-28.4) The capacitance of a spherical capacitor with inner radius a and outer radius b is proportional to: A) a/b B) b − a C) b2 − a2 D) ab/(b − a) E) ab/(b2 − a2 ) Two parallel-plate capacitors with different plate separation but the same capacitance are connected in series to a battery. Both capacitors are filled with air. The quantity that is NOT the same for both capacitors when they are fully charged is: A) Potential difference B) Stored energy C) Electric field between the plates D) Charge on the positive plate E) Dielectric constant A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is: A) R/4 B) R/2 C) R D) 2R E) 4R The terminal potential difference of a battery is less than its emf: A) Under all conditions B) Only when the battery is being charged C) Only when the battery is being discharged D) Only when there is no current in the battery E) Under no conditions A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half of the final value. The time constant for the process is about: A) 0.43 ms B) 2.3 ms C) 6.9 ms D) 10 ms E) 14 ms Magnetism • Magnetic Fields (Ch 29.1-29.6) • Sources of B-fields (Ch 30.1-30.5) • Induction and Inductance (Ch 31.1-31.3, 31.6, 32.132.3) A magnetic field CANNOT: A) Exert a force on a charged particle B) Change the velocity of a charged particle C) Change the momentum of a charged particle D) Change the kinetic energy of a charged particle E) Change the trajectory of a charged particle A loop of wire carrying a current 2.0 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.7 T uniform magnetic field is in the plane of the triangle and is perpendicular to the hypotenuse. The magnetic force on either of the two equal sides has a magnitude of: A) 0 B) 0.105 N C) 0.15 N D) 0.21 N E) 0.25 N The magnitude of the magnetic field at point P, at the center of the semicircle shown, is given by: A) 2μ0 I/R B) μ0 I/R C) μ0 I/4 D) μ0 I/2R E) μ0 I/4R The magnetic field at a distance 2 cm from a long straight currentcarrying wire is 2.0 x 10-5 T. The current in the wire is: A) 0.16 A B) 1.0 A C) 2.0 A D) 4.0 A E) 25 A A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 2.0 A the magnetic flux through each turn is: A) 0 B) 3.5 × 10−4 Wb C) 7.0 × 10−4 Wb D) 7.0 × 10−3 Wb E) 7.0 × 10−2 Wb Waves and Interference • • • • Waves (Ch 16.1-16.5) Waves & Interference (Ch 18.1-18.4, 18.7) Interference of Light (Ch 37.1-37.4, 38.4) Diffraction (Ch 38.1-38.3) You are in Japan in the year 1872, and are walking down the center of a long straight road of width w. Suddenly, two ninjas drop down from trees on either side of the road a distance L away from you. It is well known that these ninjas are experts in wave interference and have been using this to explode peoples head by simply yelling (It is a well know fact that ninja training allows them to yell coherently and in phase. This training limits them to using only a single frequency f.) You see them both yell, and know you must move to a nearby node. What is the shortest distance perpendicular to the road that you must travel? Assume the speed of sound is v. A sinusoidal transverse wave is traveling on a string. Any point on the string: A) Moves in the same direction as the wave B) Moves in simple harmonic motion with a different frequency than that of the wave C) Moves in simple harmonic motion with the same angular frequency as the wave D) Moves in uniform circular motion with a different angular speed than the wave E) Moves in uniform circular motion with the same angular speed as the wave A standing wave pattern is established in a string as shown. The wavelength of one of the component traveling waves is: A) 0.25 m B) 0.5 m C) 1 m D) 2 m E) 4 m If we increase the wavelength of the light used to form a double-slit diffraction pattern: A) The width of the central diffraction peak increases and the number of bright fringes within the peak increases B) The width of the central diffraction peak increases and the number of bright fringes within the peak decreases C) The width of the central diffraction peak decreases and the number of bright fringes within the peak increases D) The width of the central diffraction peak decreases and the number of bright fringes within the peak decreases E) The width of the central diffraction peak increases and the number of bright fringes within the peak stays the same A parallel beam of monochromatic light is incident on a slit of width 2 cm. The light passing through the slit falls on a screen 2 m away. As the slit width is decreased: A) The width of the pattern on the screen continuously decreases B) The width of the pattern on the screen at first decreases but then increases C) The width of the pattern on the screen increases and then decreases D) The width of the pattern on the screen remains the same E) The width of the pattern on the screen changes color going from red to blue That’s it. The end. Good luck. ...
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