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Practice exam 1 1) A conductor receives a positive charge, does its mass increase, decrease, stay the same? 2) The distance between two charges is doubled, what happens to the electric force? 3) What is the electric field inside any charged conductor? 4) A box encloses a charge distribution. The are more field lines coming out of the box than into the box. Is the net enclosed charge positive or negative. 5) A negatively charged plate is held above a positively charged plate. What direction does the electric field point? 6) Where is the electric field stronger? Where the field lines are closer or farther apart. 7)Charge 1 attracts Charge 2. Charge 1 repels Charge 3. Do Charges 2 and 3 repel or attract? 8) If you have a charged conducting cup. Where does most of the charge accumulate? On the bottom or on the rim. 9) You have an electric dipole and you draw the field lines. How many of the field lines intersect? 10) The electric field from which charge distribution falls off the quickest in terms of distance. line charge, point charge, sheet of charge 11) A positive charge moves from away from a positively charge plate towards a negatively charged plate. Does the charge gain or lose potential energy? 12) Equipotential lines are parallel or perpendicular to electric field lines. 13)As a positive charge moves along an electric field line, it gains or loses kinetic energy? 14) A capacitor consists of two parallel plates. To reduce the capacitance, move the plates closer together or farther apart. 15) Using two capacitors of capacitance C, what values of capacitance can be obtained? 16) The potential difference across two capacitors in parallel is the same for each capacitor. True or False • Ch. 15 – Number 49 – Number 59 • Ch. 16 – Number 8 – Number 13 A – number 39 A parallel plate capacitor has two horizontally mounted plates of area 2 m2, that are separated by a distance of 0.4 meters. When a 12 volt battery is connected across the plates, calculate the energy stored in the battery. What is the resulting capacitance after filling the space between the plates halfway with water?