Recent content by roflcopter

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    Calculating Net Charge on a Spherical Conducting Shell

    Yes they would rearrange themselves since E would be not be 0 and so there would be a force F=qE. Now, since E=0 in the conductor then when solving for q in Gauss's law q is equal to zero. So, there should be an equal magnitude charge on the inner surface with an opposite sign (compared to the...
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    Calculating Net Charge on a Spherical Conducting Shell

    Homework Statement 10C of charge are placed on a spherical conducting shell. A -3C point charge is placed at the center of the cavity. The net charge in coulombs on the inner surface of the shell is... A. -7 B. -3 C. 0 D. +3 E. +7 Homework Equations \oint \vec{E}\cdot d\vec{a}...
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    What is the electric field 4cm from a uniformly charged plate?

    Oh. I believe it's in here: http://230nsc1.phy-astr.gsu.edu/hbase/electric/elesht.html So the eq looks like E=charge density/2*epsilon. So this is independent of distance. I see.
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    What is the electric field 4cm from a uniformly charged plate?

    Homework Statement Charge is distributed uniformly on the surface of a large flat plate. The electric field 2cm from the plate is 30 N/C. The electric field 4cm from the plate is: A. 120 N/C B. 80 N/C C. 30 N/C D. 15 N/C E. 7.5 N/CHomework Equations E=kq/r^2 (possibly) The Attempt at a...
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    How Well Do You Understand Gauss's Law?

    Consider Gauss's law: \oint \vec{E}\cdot d\vec{a} =\frac{Q_{enc}}{\epsilon_0} . Which of the following is true? A. E Must be the electric field due to the enclosed charge B. If q=0 then E=0 everywhere on the Gaussian surface C. If the charge inside consists of an electric dipole, then the...
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    Supersonic Jet: Mach 3 at Altitude 20,000m - Shock Wave & Boom Times

    Ha...I totally missed that. I used d=rt and got the time. Thanks!
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    Supersonic Jet: Mach 3 at Altitude 20,000m - Shock Wave & Boom Times

    Homework Statement A supersonic jet traveling at Mach 3.00 at an altitude of 20,000 meters is directly over a person at a time t=0 as show in figure (see below). (a) At what time will the person encounter the the shock wave? (b) Where will the plane be when the "boom" is finally heard? (Assume...
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