72 Electric PotentialP25.66(a)From Gauss’s law,EA=0 (no charge within)EkqrrrqqrBeACeAB==××=FHGIKJ=+=×−×=−FHGIKJ−−2982299899 10100 1089 9500 1045 0......ejbgVm±Vm(b)Vkr=+FHGIKJ−45 099...V∴At r2, V45 00300150..VInside r2, VrdrBrr++−FHGIKJ=− +FHGIKJz15089 9150 89 91145089 922V V....∴At r1, V+=+45089 90150150..V so VA150 V.P25.67From Example 25.5, the potential at the center of the ring isVkQRie=and the potential at an infinite distance from the ring isVf=0 . Thus, the initial and final potential energies of the pointcharge-ring system are:UQ
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .