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Review 1 Fall 2011

# Review 1 Fall 2011 - Physics 2114 Test 1 Review Fall 2011...

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Physics 2114 Test 1 Review Fall 2011 Try to work the following problems using only the equation sheet provided by Dr. Bandy (online). 1. A typical lightning flash delivers about 24 C of negative charge from cloud to ground. How many electrons are involved? electrons 2. A proton is at the origin and an electron is at the point x = 0.45 nm, y = 0.30 nm. Find the electric force on the proton. Magnitude N Direction ° (counterclockwise from the + x -axis is positive) 3. If you place an electron in an electric field = 15 (3/5 + 4/5 ) N/C, in what direction will the electron travel? (use unit vector notation) 4. An electron placed in an electric field experiences an electric force of 4.9 10 -10 N. What is the field strength? N/C 5. A 68 nC charge experiences a 120 mN force in a certain electric field. (a) Find the field strength that a 41 μC charge would experience in the same field. MN/C (b) Find the force on the 41 μC charge. N 6. What is the line charge density on a long wire if the electric field 43 cm from the wire has magnitude 295 kN/C and points toward the wire? μC/m 7. In Fig. 20.27 take q 1 = 74 μC, q 2 = - 36 μC, and q 3 = 15 μC. Find the electric force on q 3 .

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