1. Three charged particles are arranged in a line, as shown below. Calculate the net electrostatic force on particle `Q_2` due to the other two charges.

2. A uniform electric field has the magnitude of `12\ V//m`. Point `A` and `B` are inside the electric field as shown. Point `A` is `10\ cm` away from ground and point `B` is `50\ cm` form the ground. Find the electric potential at point `A` and `B`.

3. A service station charges a battery using a current of `6.7\ A` for `5.0\ h`. How much charge pass through the battery?

4. An electric clothes dryer has a heating element with a resistance of `9.6\ Ω`. (a) What is the current in the element when it is connected to `240\ V`? (b) How much charge passes through the element in `50` min?

5. What is the maximum power consumption of a `3.0`-`V` portable CD player that draws a maximum of `320\ mA` of current?

6. How many `100`-`W` lightbulbs, connected to `120\ V` as in the figure, can be used without blowing a `15`-`A` fuse?

7. A `650`-`Ω` and a `2200`-`Ω` resistor are connected in series with a `12`-`V` battery. (a) draw the electric circuit. (b) What is the voltage across the `2200`-`Ω` resistor?