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guestions help plz

 
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ms.physics



Joined: 11 Sep 2012
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PostPosted: Sun Dec 09, 2012 5:58 pm    Post subject: guestions help plz Reply with quote

1-two concentric rings, of radii R and R ' = 3.00R, that lie on the same plane. Point P lies on the central z axis, at distance D = 2.00R from the center of the rings. The smaller ring has uniformly distributed charge +Q. What must be the uniformly distributed charge on the larger ring if the net electric field at point P due to the two rings is to be zero?

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ms.physics



Joined: 11 Sep 2012
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PostPosted: Sun Dec 09, 2012 6:57 pm    Post subject: Reply with quote

2- An unkown charge sits on a conducting solid sphere of radius 10 cm. If the E-field 15cm from the center of the sphere has the magnitude 3.0E3 N/c and is directed radiually inward, what is the net charge on the sphere?

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ms.physics



Joined: 11 Sep 2012
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PostPosted: Sun Dec 09, 2012 6:59 pm    Post subject: Reply with quote

3-Two charged concentric spherical shells have radii of 10.0 cm and 15.0 cm. The charge on the inner shell is 4.10*10-8 C and that on the outer shell is 2.50*10-8 C. Find the magnitude of the electric field at r=11.0 cm and r=20.5 cm.
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