Physics Electrostatics Level: High School
Two tiny identical metal balls of 10 g each carrying equal positive charges are suspended from 1-m long strings . These balls repel each other and then come to equilibrium making an angle of 37 degree with the vertical as shown in the figure at "click here" . Calculate the charge on each ball .
Physics Electrostatics Level: 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 .
Physics Current Electricity Level: 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?
Physics Current Electricity Level: 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 ?
Physics Current Electricity Level: High School
What is the maximum voltage that can be applied across a 7.3 k ? resistor rated at 1/4 watt ?
Physics Current Electricity Level: 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 ?
Physics Current Electricity Level: 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
Physics Current Electricity Level: 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 ?
Physics Current Electricity Level: High School
What voltage will produce 0.30 A of current through a 4.6 x 10^3 resistor ?
Physics Current Electricity Level: 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 ?
Physics Electrostatics Level: 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) What is the change in energy ?
Physics Electrostatics Level: 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" )
Physics Electrostatics Level: High School
How much energy is stored by the electric field between two square plates , 1.0E1 cm on a side, separated by a 1.0 mm air gap ? The charges on the plates are equal and opposite and of magnitude 3.2 x 10^2 micro C ?
Physics Electrostatics Level: High School
Wire A has a potential difference of 50 V across it and carries a current of 2A . Wire B has a potential difference of 100 V across it and also carries a current of 2A . Compare the resistance , rates of flow of charge , and rates of flow of energy in the two wires .
Physics Electrostatics Level: High School
A 120-V electric coffeepot draws a current of 0.6 A . What is the resistance of its heating element ?