11 ID: 66285
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ElectricFieldofChargedRing ˆTotalchargeonring:QˆChargeperunitlength:l=Q/2paˆChargeonarc:dq ˆdE=kdq r2=kdq x2+a2ˆdEx=dEcosq=dEx p x2+a2=kxdq (x2+a2)3/2ˆEx=kx (x2+a2)3/2Zdq)Ex=kQx (x2+a2)3/2ˆjxj a:Ex'kQx a3,x a:Ex'kQ x2ˆ(dEx/dx)x=x0=0)x0=a/p 2 tsl34