1) A science-fair radio uses a homemade capacitor made of two 40 cm Af- 40 cm sheets of aluminum foil separated by a 0.20-mm-thick sheet of paper. Assume dielectric constant of paper is 3.0. WHAT IS THE CAPACITANCE? Express your answer using 2 significant figures.
2) A parallel-plate capacitor is connected to a battery and stores 4.5 nC of charge. Then, while the battery remains connected, a sheet of Teflon is inserted between the plates.
Does the capacitor's charge increase or decrease?
a) The capacitor's charge increases.
b) The capacitor's charge decreases.
c) The capacitor's charge remains the same
d) It's impossible to determine
By how much does the charge change? Express your answer with the appropriate units.
3) A parallel-plate capacitor is charged by a 17.0 Vbattery, then the battery is removed
A) What is the potential difference between the plates after the battery is disconnected? Express your answer with the appropriate units.
B) What is the potential difference between the plates after a sheet of Teflon is inserted between them? Express your answer with the appropriate units.
4) To what potential should you charge a 2.0 A??1F capacitor to store 1.0 J of energy? Express your answer using two significant figures.
5) A pair of 10 A??1F capacitors in a high-power laser are charged to 1.7 kV
A) What charge is stored in each capacitor? Express your answer using two significant figures.
B) How much energy is stored in each capacitor? Express your answer using two significant figures
6) A proton follows the path shown in (Figure 1) . Its initial speed is v0 = 1.5 x 106
What is the proton's speed as it passes through point P? Express your answer to two significant figures and include the appropriate units