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F94(3) - Physics 4B FINAL EXAM Chapters 23 34 Fall 1994...

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1 Physics 4B FINAL EXAM Chapters 23 - 34 Fall 1994 Name:_________________________________________ Posting Code _____ _____ _____ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 10 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. For the three charges shown at the right, find the electric field at the origin. 2. For the charge distribution of problem 1, find the total number of electric field lines that leave a sphere centered at the origin that has a radius of (a)2.00cm, (b)3.00cm, (c)4.00cm, and (d)5.00cm 3.00μC 2.00μC -5.00μC 4.50cm
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2 3. An electron is accelerated from rest through a potential difference of 2000V. Find its speed. 4. In the circuit at the right, the current through the 150 resistor is 20mA. Find (a)the current through the 50 resistor, (b)the battery voltage, (c)the current through the 100 resistor, and (d)the total current provided by the battery.
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