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2008PracticeExam1

# 2008PracticeExam1 - Name Code Summer Session 2008 ID X UCSD...

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Name: _________________________________________ Code # _________ Summer Session 2008 ID: X 1 UCSD Physics 2B Practice Exam 1 Charges, Force & Fields READ ME !!! Helpful Hints: Do this exam a few times. .. Once without the answers, Once after seeing the solutions & Once again with your formula sheet This is a good time to add formulas/constants to your sheet. Remember, this is a timed exam. .. work swiftly so you have time to check your answers. 1. How many electrons must be transferred to an electrically neutral body to produce a total net charge q tot =− 125 nC ? A. 1.25 × 10 7 B. 7.81 × 11 C. 1.28 × 12 D. 3.45 × 2. A positive charge q 1 =+ 63.0 is placed at a distance r = 15.0 cm from a negative charge q 2 45.0 . What is the magnitude of the force on one charge due to the other? A. 1.13 × 3 N B. 1.70 × 4 N C. 1.02 × 7 N D. 1.25 × 13 N 3. An initially neutral empty vacuum chamber designed to contain a hot plasma is injected with n p = 1.67 × 23 protons and n e = 7.99 × 22 electrons . What is the net charge inside the chamber? A. + 3.95 × 4 C B. + 1.39 × 4 C C. × 4 C D. × 4 C

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Name: ________________________ ID: A 2 4. Three charges q 1 = + 22.0 μ C , q 2 = − 44.0 C and q 3 = + 10.0 C are placed in a line as shown below where the distance r 1 = 1.00 cm and r 2 = 0.750 . What is the magnitude and direction of the force on the center charge q 2 ? Take the plus direction to the right. A. + 1.67 × 10 4 N B. 1.58 × 5 N C. × 4 N D. + × 5 N 5. A charge q = 23.7 mC feels a force F = 525 N at a certain point in space. What is the magnitude of the electric field at that point? A. 2.22 × 1 N C B. 2.22 × 4 N C C. 4.51 × 2 N C D. × 5 N C 6. Two charges q 1 = 40.0 C and q 2 = 20.0 C are separated by a distance r = 2.00 mm and located along a line as shown below. What is the magnitude and direction of the electric field at point x ? Take right as the plus direction. A. 6.75 × N C B. + × N C C. + 1.35 × N C D. × N C
Name: ________________________ ID: A 3 7. A thin rod of infinite length carries a linear charge density λ = 1.7 × 10 6 C / m . What is the magnitude of the electric field at a distance r = 4.2 cm from the rod? A. 7.3 × 5 N C B. 1.7 × 11 N C C. 1.4 × 7 N C D. 2.3 × 6 N C 8. An infinitely long straight wire carries a linear charge density = 2.2 × 9 C / m . A cardboard tube from an exhausted bathroom tissue roll is placed as shown in the diagram below. If the tube length L = 15 cm and radius R = 6.6 cm, what is the electric flux passing through the tube? A. 37 kN m 2 C 2 B. 68 m 2 C 2 C. N m 2 C D. N m 2 C 9. Two infinite sheets of charge are separated by a distance d = 1.20 mm and carry opposite charge densities σ = 1.30 × C m 2 . What is the electric field between the sheets? A. 14.7 N C B. 29.4 N C C. 1.15 × 21 N C D. 1.08 × 7 N C

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Name: ________________________ ID: A 4 10. Two concentric spheres carry charges + Q on the inner sphere and Q on the outer. If the inner sphere has radius R and the outer sphere 2R , what is the electric field at a point just outside the outer sphere? Take the direction pointing radially out as positive.
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2008PracticeExam1 - Name Code Summer Session 2008 ID X UCSD...

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