1. The repulsive force between two identical negative charges is 0.750 N when they are 0.100 m apart. Find the amount of each charge.
2. A charge of 2.50 x 10–8 C exerts a force of 0.0250 N on a second charge of 5.00 x 10–7 C. How far apart are the charges?
3. A positive test charge of 2.50µC is placed in an electric field. The force on it is 0.500 N. What is the magnitude of the electric field at the location of the test charge?
4. Find the magnitude of the electric field in which a negative charge of 1.50 x 10–8 C experiences a force of 0.0500 N.
5. What force is exerted on a test charge of 4.25 x 10–5 C if it is placed in an electric field of magnitude 2.50 x 104 N/C?
6. Find the resistance of 85.5 m of No. 20 aluminum wire (ρ = 2.83 x 10–6 Ω cm, A = 2.07 x 10–2 cm2).
7. At 75°F, 120 ft of wire has a resistance of 0.743 Ω. Find the resistance of 560 ft of this wire.