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Problems with solutions

I.D	Level	Problem	Problem Topic
245	High school	A 3.20 micro F capacitor is charged by a 11.0 V battery . It is disconnected from the battery and then connected to an uncharged 4.80 micro F capacitor(see the figure at "click here") a) Determine the total stored energy before the two capacitors are connected b) Determine the total stored energy after they are connected c . . . continues Click to Purchase Solution	Electrostatics
246	High school	A current of 2.30 A flows in a wire . How many electrons are flowing past any point in the wire per second ? . . . continues Click to Purchase Solution	Current & Electricity
247	High school	What voltage will produce 0.30 A of current through a 4.6 x 10^3 resistor ? . . . continues Click to Purchase Solution	Current & Electricity
248	High school	A hair dryer draws 8.4 A when plugged into a 1.2 x 10^2 V line . a) What is its resistance ? b) How much charge passes through it in 15 min ? . . . continues Click to Purchase Solution	Current & Electricity
249	High school	Calculate the ratio of the resistance of 22.0 m of aluminum wire 2.5 mm in diameter , to 16.0 m of copper wire 1.8 mm in diameter. Enter the ratio as a decimal . . . continues Click to Purchase Solution	Current & Electricity
250	High school	How much would you have to raise the temperature of a copper wire (originally at 20.0 degree C) to increase its resistance by 5.00 percent ? . . . continues Click to Purchase Solution	Current & Electricity
251	High school	What is the maximum voltage that can be applied across a 7.3 k ? resistor rated at 1/4 watt ? . . . continues Click to Purchase Solution	Current & Electricity
252	High school	At $ 0.071 per kWh , what does it cost to leave a 1.0 x 10^2- W porch light on day and night for a year ? . . . continues Click to Purchase Solution	Current & Electricity
253	High school	An extension cord made of two wires of diameter 0.129 cm and of length 2.7m(9.0 ft) is connected to an electric heater which draws 10.0 A on a 1.2 x 10^2 V line. How much power is dissipated in the cord? . . . continues Click to Purchase Solution	Current & Electricity
254	High school	As per the figure shown at "click here" find the resultant force on charge q3 . If q1 = 130 micro C , q2 = 5.0 micro C , q3 = 4.00 micro C , rl = 0.5 m , and r2 = 0.8m . . . . continues Click to Purchase Solution	Electrostatics

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