You find an old battery with an unknown EMF, \varepsilonε, and an unknown internal resistance, r. You can characterize the battery using two known resistors and a good ammeter. When you put the battery in series with the first resistor R_1 = 100~\OmegaR 1 =100 Ω, you measure a current through it of I_1 = 0.093 AI 1 =0.093A. You then remove the first resistor and replace it with the second resistor, R_2 = 500~\OmegaR 2 =500 Ω, and now measure a current through it of I_2 = 0.019I 2 =0.019. Calculate the internal resistance of this mystery battery. Assume the ammeter is ideal and has negligible resistance)
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Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?
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You find an old battery with an unknown EMF, \varepsilonε, and an unknown internal resistance, r. Yo...
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