Practice Problems -Test 2

1. When bodies exchange electric charge, the net charge of the system----a. increases b. decreases c. stays the same d. increases for conductors

2. A body in which electric charges arefree to move is called a. a conductor b. an insulator c. a dielectric d. a ferroelectric

3. Negative charge will exist on macroscopic bodies that have excess a. protons b. electrons c. neutrons d. nuclei

4. Positive charge will exist on macroscopic bodies that have too fewa. protonsb. electronsc. neutronsd. nuclei

5. In metallic conductors the charges that are free to move are a. protonsb. electronsc. neutronsd. nuclei

6.Two charges q₁=2 mC and q₂ = -6mC are located on the x-axis at coordinates x₁=2 cm and x₂=4 cm. (a.) The magnitudeof the electrical force that q₁ exerts on q₂ is---270 N(b).The magnitude of the electric field that q₁ exerts at q₂ is--- 45x10⁶ N/C

7. The figure at right shows an arrangementof three -2 mC charges. a. The force that the other two charges exert on q₃ has a magnitude-- 45.9 N.b. The electric field that the two charges exert on q₃ has a magnitude---- 23x10⁶ N/C.

8.Three are arranged in an equilateral triangle 5 cm on a side. q₁=3 mC, q₂= -3 mC and q₃ = - 3 mC. a. The force on q₂ due to the other two charges has a magnitude--- 32.4 N b. The electric field on q2 due to the other two charges has a magnitude---10.8 M N/C.

9. Electric field lines always point towarda. the charge that they act onb. the source charge c. positive source chargesd. negative source charges.

10.The direction of the electric field is a. the same as that of the force on a positive test chargeb. the same as that of the force on a negative test charge c. away from the charges that are the source of the fieldd. toward from the charges that are the source of the field.

11.A 5mC charge, located at coordinate (2,-1)in cm, is subject to an electric field of E = (0.5 i + 0.5 j ) M N/C. a. The x-component of the force on this charge is --- 2Nb. The y-component of the force on this charge is --- 2.5 N

12.The electric field in a region of space is E = 12,000 i + 20,000 j N/C.a. The electric flux through a 2 m2 plane normal to the y-axis is ---40,000 Nm2/C.b. The electric flux through a 2 m2 plane normal to the y-axis is ---24,000 Nm2/C.

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