40 C of charge are separated in a huge thundercloud. The difference in potential

Question

40 C of charge are separated in a huge thundercloud. The difference in potential between the center of the positive and negative charges is 1.8 Times 10^8 volts. A lightning bolt reunites the entire 40 C in 40 ms. How much energy was stored in the cloud? How large is the current in the lightning bolt? What is resistance of the air during the lightning strike? About how big is the thundercloud? (Explain any assumptions) How large was the electric field between the charges before the lightning stuck? A fuse at 20 amps is made of a 1.5 mg strip of metal that is 1 mm thick, 2 mm wide and 0.75 mm long. The metal has a resistivity of 1.5 Times 10^-7 Ohm-m. Melting the fuse takes 0.042 cal. What is the resistance of the fuse? How much power is being delivered to the fuse when it blows (melts)? How long will the fuse last once the 20 amps begins to flow? How much charge will have flowed through the fuse in that time? A 1.2 m long fluorescent tube has a uniform electric field of 360 N/C passing from the + to - end. 0.5 ma of current is flowing through the tube. How many electrons flow through the tube per second? What is the voltage between the ends of the tube? How much power does the tube use? How large is the force on an electron in the middle of the tube? In which direction does the force point?

Explanation / Answer

1) a) energy = potential difference * charge = 40*1.8*10^8=7.2*10^9J

b)current = charge united/time=40/(40*10^-3)=1000A

c)resistance = V/I=1.8*10^8/(1005)=1.8*10^6ohm

d)Assumption lightning travels at speed of light so length=c*t=3*10^8*40*10^-3=12000000m=12000km

e)electric field =

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