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  1. B

    How to draw vectors to show the B field (magnetic field) at point P?

    http://session.masteringphysics.com/problemAsset/1042409/9/YF-28-60.jpg picture is above. How would the B vector look like for each wire? There is one going into the page and one going out of the page. And what is the net B field? Also, how to determine what value of x gives max B field? (if...
  2. B

    Really quick-Why is my magnetic field vector drawing incorrect? Pic shown?

    http://tinypic.com/r/1531tae/7 why is this incorrect? I pressed submit and its telling me to try again. I am supposed to show magnetic field vectors on point P . The top wire is coming out of the page. The bottom wire in going into the page. I drew B1, B2 and net B
  3. B

    If A is a 5x5 matrix, and A^T=-A , show that A is singular? 10 points?

    If A transpose =-A, Show that A is singular please show any or all methods. I know you can compute determinant but I do not know how. OTHER QUESTIONS I HAVE to study for an exam:(can you explain briefly or however you want, the following? especially number 6) 1) A is a 4x4 matrix...
  4. B

    Can someone elaborate on this previously answered PROOF question?

    http://answers.yahoo.com/question/index;_ylt=Ak.iBxE2OXu.CQvAY7qdzDwjzKIX;_ylv=3?qid=20080708170131AAjrUst The question is :Let A be an nxn matrix. Is it possible for A^2 + I = 0 if n is odd? Where n is even? I still don't understand this part : [ det(A) ]^2 = det( -I ) what do you do...
  5. B

    Gauss's Law: how do I calculate net electric field?

    http://session.masteringphysics.com/problemAsset/1054114/3/YF-22-63.jpg Positive charge Q is distributed uniformly over each of two spherical volumes with radius . One sphere of charge is centered at the origin and the other at x=2R Find the magnitude of the net electric field due to these...
  6. B

    Net Electric field due to two Distributions? express in terms of?

    Positive charge Q is distributed uniformly over each of two spherical volumes with radius R . One sphere of charge is centered at the origin and the other at x=2R The question it is asking is Find the magnitude of the net electric field due to these two distributions of charge at x=R/2 on the...
  7. B

    When a guy looks at you and runs his hand through his hair slowly?

    Okay so does this mean anything? Just curious. Like when he is talking to you and he slowly runs his hand through his hair while looking at you
  8. B

    How does paypal dispute item returns work?

    It says i have to show proof of postage-- a tracking number in order to qualify for full refund. When will they actually refund me my money?
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