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Practice exam _1_B

# Practice exam _1_B - 1 A B C D E When a solid rubber rod is...

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1. When a solid rubber rod is given a net electric charge by rubbing it with wool: A) positive wool molecules are transferred from wool to rod B) positive rubber molecules are transferred from rod to wool C) protons are transferred from rod to wool D) electrons are transferred from wool to rod. E) protons are transferred from wool to rod 2. A 2 µ C charge is placed at the origin, an identical charge is placed 2 m from the origin on the x axis, and a third identical charge is placed 2 m from the origin on the y axis. The magnitude of the force on the charge at the origin is: A) 1.3 × 10 –2 N B) 1.8 × 10 –2 N C) 6.4 × 10 –3 N D) 3.6 × 10 –2 N E) 9.0 × 10 –3 N 3. Identical + and - point charges of 3 μC (μ=10 -6 ) are fixed to the ends of a rigid, 0.10 m long, insulating stick. The stick is aligned in a uniform electric field of 100 V/m as shown. If you turn the stick slowly through 3 complete revolutions clockwise about an axis perpendicular to the page the amount of work you do is: E +q -q A) 3 x 10 -5 Joules B) 18 x 10 -5 Joules C) 9 x 10 -5 Joules D) 0 E) 6 x 10 -5 Joules 4. In a certain region of space the electric potential V increases linearly as you head due south and does not vary in any other direction. The electric field: A) points east and does not vary with position B) points north and varies with position C) points south and does not vary with position D) points north and does not vary with position E) points south and varies with position Page 1

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5. Choose the FALSE statement concerning electric fields, field lines, and equipotential surfaces (EPS) under electrostatic conditions: A) EPS are widely spaced where the electric field is small B) conductor surfaces are EPS with E normal =0 C) E fields point in the direction of maximum decrease in potential D) field lines cannot cross, nor do EPS intersect E) field lines are close together where the electric field is large 6. What is the x component
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Practice exam _1_B - 1 A B C D E When a solid rubber rod is...

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