Phys._219_Lec.05._2012.

Phys._219_Lec.05._2012. - Lecture 5-1 Physics 219 Question...

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Lecture 5-1 A charge of Q is placed on the inner ball. What is the total charge induced on the inside surface of the outer shell? Physics 219 – Question 1 – January 25, 2012 a) 0 b) Q c) - Q d) - Q/2 e) depends on the net charge on the outer shell
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Lecture 5-2 Electric Current Current = charges in motion   0 lim t q I t  Magnitude rate at which net positive charges move across a cross sectional surface Units: [I] = C/s = A (ampere) Current is a scalar, signed quantity, whose sign corresponds to the direction of motion of net positive charges by convention
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Lecture 5-3 Electric Current and Human Body Current flowing through your body: disrupts muscle (including the heart) interferes with the nervous system. 1 mA can be felt 5 mA painful, but no damage 10 mA involuntary muscle contractions, 15 mA paralysis 70 mA lethal if pass through heart for more than 1 sec 100-300 mA ventricular fibrillation (heart trouble!!), death A defibrillator sends a brief current of several Amps near the heart, which causes the heart to suddenly contract, after which it may return to normal operation.
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Lecture 5-4 Microscopic View of Electric Current in Conductor
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Phys._219_Lec.05._2012. - Lecture 5-1 Physics 219 Question...

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