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AL 05 PHY MC

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請幫幫忙 05 Q11 why the angle i should be less than a certain value?05 Q12P,Q and R are small identical metal spheres. P and Q are fixed at a certain separation in vacuum and they carry charges of the same magnitude. the attractive force between them is F. sphere R is initially uncharged. it frist touches P and... 顯示更多 請幫幫忙 05 Q11 why the angle i should be less than a certain value? 05 Q12 P,Q and R are small identical metal spheres. P and Q are fixed at a certain separation in vacuum and they carry charges of the same magnitude. the attractive force between them is F. sphere R is initially uncharged. it frist touches P and then it touches Q. what is the electrostatic force between P and Q after R is taken away? 05 Q15 why ans is 28*10^-6C 更新: Q(15) When K is closed . why 1mA? and 6V & 0V?

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(11) First of all, for total internal reflection to occur, it is a must that n1 > n2. Then, let r be the angle of refraction at the n1-air interface (Suppose that the light incidence is from air). Now we have: r = sin-1(sin i/n1) Then, at the n1-n2 interface, the angle of incidence is 90° - r and, for total internal reflection to occur, 90° - r must be greater than certain value, say θ (critical angle). Now, we have: 90° - r > θ 90° - sin-1(sin i/n1) > θ sin-1(sin i/n1)
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