Conversions 1km hr 277777m s Prefix tera giga mega kilo hecto deca base deci centi milli micro nano pico Symbol T G M k h da d c m cid 542 n p 10x 12 9 6 3 2 1 0 1 2 3 6 9 12 eq R n of 2R V2 cid 32 cid 53 cid 11 cid 20 cid 14 cid 303 cid 168 cid 55 cid 12 eq 1 R1 1 R 2 1 R 3 EXAM 1 Constants K dielectric current 1 if in the air cid 306 cid 3 cid 11 cid 87 cid 76 cid 80 cid 72 cid 3 cid 70 cid 82 cid 81 cid 86 cid 87 cid 68 cid 81 cid 87 cid 12 cid 32 cid 53 cid 38 Electrostatics Electric Fields Positive In Negative Out N C or V m Magnitude Ef KQ R2 E kQ 1Q 2 R Electrostatic Force F 2 Gravitational Force F G GM 1M 2 Definition of a Coulomb C A s Potential at point r away from Q V kQ r Electric Potential Energy EPE q 0V Direct Currents DC Definition of Current cid 44 cid 32 cid 11 cid 508 cid 52 cid 12 cid 18 cid 11 cid 508 cid 87 cid 12 Definition of Ampere A C s Reaction between current and drift velocity I enAv d electrons Ohm s Law V IR Resistivity cid 53 cid 32 cid 546 cid 11 cid 47 cid 18 cid 36 cid 12 or cid 546 cid 32 cid 53 cid 11 A L Temperature Dependence of resistivity cid 546 t cid 32 cid 3 cid 546 cid 11 cid 20 cid 14 cid 303 cid 168 cid 55 cid 12 cid 3 cid 82 cid 85 cid 3 R t Power Dissipated in a resistor P I Resistors in series R eq R 1 R 2 R 3 Resistors in parallel 1 R Voltage on a load due to a battery with internal resistance rb IR V Ir b cid 58 cid 32 cid 84 cid 508 cid 57 potential difference change in volts Capacitors Definition of a capacitance C Q V Unit of capacitance Farad 1Coluomb per volt Capacitance of parallel plates cid 38 cid 32 cid 36 cid 18 cid 11 cid 23 cid 653 cid 78 cid 71 cid 12 cid 3 or cid 38 cid 32 cid 11 cid 305 0 Capacitor with dielectric C Electric Potential Energy stored in a capacitor U Q Capacitor discharging through a resistor Q t Q cid 52 cid 32 cid 44 cid 508 cid 87 cid 3 cid 30 cid 3 cid 52 cid 32 cid 38 cid 508 cid 89 cid 3 cid 30 cid 3 cid 44 cid 508 cid 87 cid 32 cid 38 cid 508 cid 57 Capacitance in series 1 C eq 1 C 1 1 C 2 1 C 3 Capacitance in parallel C Lon Capa While wearing rubber soled shoes you rub a helium balloon on your sweater The balloon becomes negative charged now released the balloon When the balloon is at the ceiling you are cid 120 Some electric fluid flowed from the fur to the amber F cid 120 Electrons were transferred from the amber to the fur F cid 120 Electrons were transferred from the fur to the amber T cid 120 Some electric fluid flowed from the amber to the fur F Amber is rubbed with cat s fur The amber is then negatively charged In other words cid 120 Some electric fluid flowed from the fur to the amber F cid 120 Electrons were transferred from the amber to the fur F cid 120 Electrons were transferred from the fur to the amber F cid 120 Some electric fluid flowed from the amber to the fur F True or False Coulomb s law states that the force between static charges Q 1 and Q 2 cid 120 cid 120 cid 120 cid 120 cid 120 Click on the arrow which best represents the force on the lower pink charged sphere Is KQ Is a force of attraction F Is KQ 1Q 2 Is proportional to 1 r F Is proportional to the total charge Q 1 Q 2 r where K is a universal constant F where K is a universal constant T eq C 1 C 2 C3 2 2C CV2 2 QV 2 AdK d 1Q 2 r2 t RC k KC F 0e 0 1q 2 r2 F 8 99E9 1 6E 19 79 1 6E 19 1 9E 12 2 F kq 01285N A positive point charge q is placed at point p to the right of two charges A and B The net force on the q charge is found to be zero True or False cid 120 Reversing the sign of q to q would make the force on it cid 120 B must have the opposite sign from A and be less in nonzero F magnitude T cid 120 Either A or B must be positive T cid 120 A must be negative F cid 120 B must have the same sign as A and be less in magnitude F Three electr c charges are arranged on a straight line as shown in the figure True or False cid 120 cid 120 cid 120 cid 120 1 is positive Q 2 is negative and Q 3 is positive then Q 2 If Q 1 is positive Q 2 is negative and Q 3 is negative then Q 2 MUST feel a net force to the right F If Q MIGHT feel a net force to the right T If Q MUST feel a net force to the right F If Q MUST feel a net force to the right T 1 is negative Q 2 is negative and Q 3 is positive then Q 2 1 is positive Q 2 is negative and Q 3 is positive then Q 2 2 F foil and Give your answer with a 1 1 99x10 6 C Q 2 Q 1 and be changed from position to negative At which 1q 2 r2 F 2 F 1 F 3 F 8 99E9 1 99E6 2 1 562 In the above figure R 1 56m Q Q 3 Q 1 Calculate the total force on Q 2 positive number for a force directed to the right F kq F 2 2 93E 2N 1 6 03nC is placed at the origin of An electric point charge of Q the real axis Another point charge of Q 2 3 87nC is placed at a position of p 2 89m on the real axis At which position can the third point charge of q 5 27nC be placed so that the net electrostatic force on it is zero F 1q F 2q F kqQ 2 r2 8 99E9 q 6 03E 9 r2 8 99E9 q 3 87E 9 2 89 r 2 cancel k q then cross multiply 6 03E 9 2 89 r 2 3 87E 9 r2 solve for r using quadratic 1 605m Let the sign of Q position can the point …