PHYS 112 Midterm: PHYS 112 Iowa State Exam1 F15
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Fall 2015: two small conducting spheres have equal and opposite charges, as shown. Each experiences an attractive coulomb force of 3. 6 n due to the other. The spheres are brought together, briefly make contact, and are then separated again by 25 cm. What is the magnitude of the coulomb force now: 1. 8 n, 3. 6 n, 0 n, 5. 4 n, 7. 2 n. + 5. 0 c: a 6. 0 c point charge is placed 4. 0 cm to the right of a + 2. 0 c point charge. The potential is zero very far away from these charges. The potential at a point mid-way between the charges is: positive, negative, zero, pointing right towards the negative charge, pointing left towards the positive charge. Fall 2015: the figure shows electric field lines for two point charges, q1 (left) and q2 (right). An electron (mass = 9. 11 10-31 kg, charge =
