Help with electricity?

Question

Please answer and explain these questions.

1. A 1.5 volt, AAA cell supplies 750 milliamperes of current through a flashlight bulb for 5.0 minutes, while a 1.5 volt, C cell supplies 750 milliamperes of current through the same bulb for 20 minutes. COmpared to the total charge transferred by the AAA cell through the bulb, the total charge transferred by the C call through the bulb is what?

2. A 9 volt battery is connected to a 4 ohm resistor and a 5 ohm resistor in series. What is the current in the 5 ohm resistor?

3. In the diagram below, a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.2 meter from the test charge. Sphere B has a charge of -2q and is located 0.1 meter from the test charge.
X = test charge

A -------0.2m---------X-------0.1m----------B

thank you

Opps i forgot the question on 3. If the magnitude of the force on the test charge due to sphere A is F, what is the magnitude of the force on the test charge due to sphere B?

WOW you dont have to answer it! An explaination of how to solve it is good.

Answer 1

Eugene is right; the questions are really simple; don’t sleep in the class;
♠ charge q1=I*t1 and q2=I*t2, hence q2/q1= t2/t1 =20/5 =4; AAA is 4 times better;
♣ ohm’s law: u=I*R, where R=r1+r2 for series circuit; thus 9=I*(4+5),
hence I= 1A no matter be it r1 or r2;
♦ coulomb’s law: pushing force exerted by A is F= k*(2q)*1/(0.2)^2, while pulling force exerted by B is F2=k*(-2q)*1/(0.1)^2; hence |F2/F| = (0.2/0.1)^2 =4; B is pulling 4 times stronger than A is pushing;

Answer 2

Sounds like interesting homework. It's easy for me but if I do it, you'll learn nothing and fail the test. I would be hurting you. I don't like to do that. Have fun learning.