Answer all Home Final Exam (duarai l. questions. For credit show 4.28.17 Due to

Question

Answer all Home Final Exam (duarai l. questions. For credit show 4.28.17 Due to its the work where necessary Find the have structure, a DNA molecule acts like a spring that can be compressed of the force constant one type of DNA a 75 long for um A that charge 0.60 nNInm the a of +12pC and at one 2. and A neuromuscular the other capacitor suffering neuromuscular a device designed to be supplies an paralyzed muscles or (b) can supply dysfunction The device electric current the the he 10 mA of current uses a a microchip initial charge on for 200 us before it's fully discharged if the capacitor and it's initially to 4.5 e penetrate separates the interior of a living cell from its surrounding. So-called ion channels One the membrane, allowing passage of materials into and out of cell What is for allows of 104 ionized K" during this time. the current in the current in the channel? hat is the resistance of the ion channel if the potential difference across the channel in Ca) i (c) Th ion channel can be modelled as a cylinder with a length of 6.0 nm and a diameter of is 0.35 nm. What is the resistivity of the fluid filling the (d) At what rate is the energy dissipated while the ions are flowing? A medical cyclotron with a 2.0 T magnetic field is intended to accelerate deuterium muclei (deuterons), consisting of one proton and one neutron. (b) At what frequency should the potential difference (p.d.) between the dees be alternated? If the vacuum chamber has a diameter of 0.90 m, what is the maximum kinetic energy of the deuterons (c) If the p.d. is 1500 V, how many orbits do deuterons complete before achieving the maximum energy

Explanation / Answer

Ans 1

Here Electric force = Spring force of DNA

THerefor kq1q2/r2 = kx

9*109*1.2*1.2*(10-12)2/(75*10-6)2 = 0.6 x

x = 3.84*10-6 m

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