Physics Electrostatics Level: High School
The normal hydrogen atom consist of a proton nucleus and an orbital electron . Assume that the electron orbit is circular and that the constant distance between the proton and electron is 5.3 x 10^-11 m . What is the orbital speed of the orbiting electron ? (Hint: The centripetal force that keeps these electron in its orbit must equal the force of attraction)a) 1.4 x 10^6 m/sec
b) 1.90 x 10^6 m/sec
c) 2.19 x 10^6 m/sec
d) 3.11 x 10^6 m/sec
F = mv^2/r
Physics Electrostatics Level: High School
The normal hydrogen atom consist of a proton nucleus and an orbital electron . Assume that the electron orbit is circular and that the constant distance between the proton and electron is 5.3 x 110^-11 m . What is the force of attraction between the two fundamental particles ?a) 1.77 x 10^-8 N
b) 3.35 x 10^-8 N
c) 6.18 x 10^-8 N
d) 8.20 x 10^-8 N
Physics Electrostatics Level: High School
The parallel cathode and plate of a vacuum tube are 2 cm apart and have 120 V between them . What is the energy dissipated as heat on the plate ?a) 1.89 x 10^-17 J
b) 3.21 x 10^-17 J
c)1.11 x 10^-16 J
d) 4.00 x 10^-16 J
Physics Current Electricity Level: High School
Two scales on a voltmeter measure voltage up to 20.0 and 30.0 V , respectively . The resistance connected in a series with the galvanometer is 1680 Ohm for the 20 V scale , and 2930 Ohm for the 30 V scale . Determine the coil resistance and the full scale current of the galvanometer that is used in the voltmeter .
Physics Current Electricity Level: High School
Two resistances , R1 and R2 , are connected in series across a 12V battery . The current increases by .20 A when R2 is removed , leaving R1 connected across the battery . However , the current increases by just . 10A when R1 is removed , leaving R2 connected across the battery . Finda) R1
b) R2
Physics Current Electricity Level: High School
A piece of nichrome wire has a radius 6.5 x 10-4 m . It is used in the laboratory to make a heater that dissipates 4.00 x 102 W of power when connected to a voltage source of 120 V . Ignoring the effect of temperature on resistance , estimate the necessary length of wire .
Physics Electrostatics Level: High School
A positive charge of +Q1 is located 3.00 m to the left of a negative charge –Q2 . The charges have different magnitudes . On the line through the charges , the net electric field is 0 at a spot 1.00 m to the right of the negative charge . On this line there are also two spots where the potential is 0 . Locate these two spots relative to the negative charge .
Physics Electrostatics Level: High School
A square is .50 meters on a side . Four identical charges (5.0 mC each ) are brought from infinity and placed on the square , one to a corner . Find the electric potential energy of the group .
Physics Electrostatics Level: High School
An electron and a proton starting from rest , are accelerated through an electric potential difference of the same magnitude . In the process , the electron acquires a speed Ve while the proton acquires a speed Vp . Find the ratio Ve/Vp .
Physics Electrostatics Level: High School
A uniform electric field has a magnitude of 2.3 x 103 N/C . In a vaccum a proton begins with a speed of 2.5 x 104 m/s and moves in the direction of this field . Find the speed of the proton after it has moved a distance of 2.0 mm .
Physics Electrostatics Level: High School
Two spherical shell have a common center . A negative 1.6 x 10-6 C charge is spread uniformly over the inner shell , which has a radius of .050 m . A positive 5.1 x 10-6 C charge is spread uniformly over the outer shell , which has a radius of , 15 m Find the magnitude and direction of the electric field at a distance (measured from the common center) ofa) .20 m
b) .10 m
c) .025 m
Physics Electrostatics Level: High School
A particle of mass 3.8 x 10-5 kg and charge +12 mC is released from rest in a region where there is a constant electric field of 480 N/C . How long does it take the particle to travel .020 m ?
Physics Electrostatics Level: High School
What is the speed of a particle that accelerates from rest in a uniform electric field of 1000 N/C ? The particle travels 4m . The particle has a mass of 1/1000 kg and a charge of (-2)*(10 to the -6th power) C .
Physics Electrostatics Level: High School
A tiny sphere caries a charge of (3)*(10 to the -6th power)C . How large a force would it exert on a +4C point charge placed 300 cm away ? what are the magnitude and the direction of the electric field strength 300 cm from the center of the sphere ?
Physics Electrostatics Level: High School
In a certain television picture tube a charge of (2)*(10 to the -4th power) falls through a potential difference of 22,000 V each second. How much electric potential energy is lost each second ? How many calories of heat are generated each second as the charge strikes the end of the picture tube ?