Choose the best answer. 1 . During a lightning strike from a cloud to the ground

Question

Choose the best answer. 1 . During a lightning strike from a cloud to the ground, the current can be as high as 25000 A and last for about 40 Mus. How much charge is transferred to the ground during such a strike? A. 10^6C B. 10^3C C. 1 C D. 10^-2 C E. none of the above 2. Consider the block of copper shown at right. Which of the following can affect the conductivity in that block of copper? A. electric field in the block B. number density of free charge carriers in the block C. volume of the block D. mass of the block E. none of the above For questions 3 and 4: Two copper wires of differing diameters are welded together as shown below. 3. A current I flows into the left end. How much current flows out of the right end? A.I B. 2I C. I/2 D. I/4 E. none of the above 4. If the electric field strength in the left wire is E1 , what is E2 in terms of E1 ? (Hint: j = sigmaE) A. 4E1 B. 2E1 C.E1 D. E1/2 E. none of the above 5. A student is studying a cylindrical sample of material X. She applies different potential differences across the ends of the sample and measures the current through the sample. She obtains the data shown at right. According to her data, material X most likely A. obeys Ohm?s law B. does not obey Ohm's law C. her data is inconclusive

Explanation / Answer

6) C

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