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 ?
Physics Electrostatics Level: High School
A 2g ball hangs as a pendulum of a very thin thread . It hangs at an angle of 30 degrees when placed in a horizontal field of (5)*(10 to the 4th power) N/C . What is the charge on the ball ?
Physics Electrostatics Level: High School
In a certain region of space an electron experience a force (3)*(10 to the -16th power) N in the +x direction . What are the magnitude and direction of E in that region ?
Physics Electrostatics Level: High School
Two point charges are on the x-axis . A 5uC charge is at x = 0 and a -3iC is at x = 4 m . Where can a third charge be placed so that the net force on it is zero ? Why need we not specify the sign or magnitude of the third charge ?
Physics Electrostatics Level: High School
Two point charges are 4m apart and each exerts an attractive force of (3.6)*(10 to the -8the power) N on the other . One charge is twice the other in magnitude . Find the magnitudes of the two charges . Can you tell from the data which charge is negative ?
Physics Electrostatics Level: High School
Two point charges have values +5uC and -7uC . The 5-uC charge is at x = 0 and the -7 uC charge is at x = 30 cm on the x –axis . Find the magnitude and direction of the force on the -7uC charge . Repeat for the 5uC charge .
Physics Electrostatics Level: High School
Find the electrical potential at a point P = (x,0) due to two positive charge of magnitude Q = 1 nC located at points S = (0,A) and R = (0,-A) .a) Find the answer using superposition of the potentials due to each charge .
b) Find the work done by the electric field of two charges when a third charge of equal magnitude is moved from point (2A,0) to (A,0) .
Physics Electrostatics Level: High School
The three charges in the figure which is shown at ‘click here’ are at the vertices of an isosceles triangle . Calculate the electric potential at the midpoint of the base , if q = 7.00 nC .
Physics Electrostatics Level: High School
A neutron is thought to be composed of one “up” quark of charge +(2/3) e and two “down” quarkd each having charge –(1/3)e . If the down quarks are 2.6*10^(-5) m apart inside the neutron , what is the repulsive electrical force between them ?
Physics Electrostatics Level: High School
An insulating rod of length L has charge –q uniformly distributed along its length , as shown in the figure at ‘click here’ .a) What is the linear charge density of the rod ?
b) Find the electric field at the point P a distance A from the end of the rod .
c) If P were very far from the rod compared to L , the rod would look like a point charge. Show that your answer to (b) reduce to the electric field of a point charges for A>> L .
Physics Electrostatics Level: High School
The figure at “click here” shows a long, non-conducting, massless rod of length L. pivoted at its center and balanced with a block of weight W at a distance x from the left end . At the left and right ends of the rod are attached small conducting spheres with positive charges q and 2q , respectively . At distance h directly beneath each of these sphere is fixed sphere with positive charges Q .a) Find the distance x when the rod is horizontal
b) What value should h have so that the rod exerts no vertical force on the bearing when the rod is horizontal and balanced ?
Physics Electrostatics Level: High School
a) What equal positive charges would have to be placed on Earth and on the Moon to neutralize their gravitational attraction ? Do you need to know the lunar distance to solve this problem ? Why or why not ?b) How many kilograms of hydrogen would be needed to provide the positive charge calculated in (a) ?
