1. Two identical charges, each -8.00 x 10-5C, are separated by a distance of 25.0 cm.
2. What is the electric force exerted on a test charge of 3.86 x 10-5
C if it is placed in an electric field of magnitude 1.75 x 104N/C?
3. Find the resistance of 134 m of No. 20 copper wire at 20° C (ρ = 1.72 x 10-6Ω cm,A = 2.07 x 10-2 cm2).
4. What is the cost to operate a 100 W lamp continuously for one week when the power utility rate is 20 cents/kWh?
5. A 1000 W microwave, a 40.0 W fluorescent light bulb, and a 550 W computer are plugged into a 120 V parallel circuit.
a. What is the current passing through each appliance in the parallel circuit?
b. Find the resistance of each appliance.
6. A magnetic field can deflect a beam of electrons, but it cannot work on the electrons to change their speed. Why?
7. Find the magnetic field at 0.500 m from a long wire carrying a current of 7.5 A.
8. An auto mechanic wants to use a solenoid she found on a car starter. If the solenoid is 0.150m in length and has 750 turns of wire, what amount of current is required to produce a magnetic field of 1.50 x 10-3 T at its centre?
9. Write a paragraph to describe how a generator functions to generate power. Use common electromagnetic physics terms, such as induction, coil, and current.
10. Write a paragraph to describe the differences and similarities between a motor and a generator.