4/6/11 1 Physics 1224/6/11 2 Physics 1224/6/11 3 Physics 122 7.1 7.2 7.3 7.4 a 6% 3% 7% 7% b 43% 5% 24% 72% c 27% 18% 1% 10% d 4% 6% 63% 3% e 68% 1% 1% 2% f 8% 67% 0% 0% be 4%4/6/11 7 Physics 122 Fq=FQ1→ q+FQ2→ q+FQ3→ q+FQ4→ q+ ... Fq=kCqQ1r12r1+kCqQ2r22r2+kCqQ3r32r3+kCqQ4r42r4+ ...where r1= distance from Q1 to q r1= direction from Q1 to q (mag. 1, no units!)r2= distance from Q2 to q r2= direction from Q2 to q (mag. 1, no units!)...4/6/11 8 Physics 122 Fq=kCqQ1r12r1+kCqQ2r22r2+kCqQ3r32r3+ ...Eq=Fqq=kCQ1r12r1+kCQ2r22r2+kCQ3r32r3+ ... Fq=kCqQ1r12r1Eq=Fqq=kCQ1r12r14/6/11 9 Physics 1224/6/11 10 Physics 1224/6/11 11 Physics 122 [λ] =QL⎡⎣⎢⎤⎦⎥[σ] =QL2⎡⎣⎢⎤⎦⎥[E] = kQL2⎡⎣⎢⎤⎦⎥[E] = kλL⎡⎣⎢⎤⎦⎥[E] = kσ[]4/6/11 12 Physics 122 E =kCQr2E =2kCλdE = 2πkCσ4/6/11 13 Physics 1224/6/11 15 Physics 1224/6/11 16 Physics 122 The fields of the two plates cancel each other on the outside. The fields of the two plates cancel each other on the outside. The fields of the two plates add on the inside, producing double the field of a single
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