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) ?
Physics Electrostatics Level: High School
A certain charge Q is divided into two parts q and Q – q , which are then separated by a certain distance . What must q be in terms of Q to maximize the electrostatic repulsion between the two charges ?
Physics Electrostatics Level: High School
Two identical conducting spheres , fixed in place , attract each other with an electrostatic force of 0.108 N when separated by 50.0 cm , center to center . The spheres are then connected by a thin conducting wire . When the wire is removed , the spheres repel each other with an electrostatic force of 0.0360 N . What were the initial charges on the spheres ?
Physics Electrostatics Level: High School
Two equally charged particles , held 3.2 x 10^-3 m apart , are released from rest . The initial acceleration of the first particle is observed to be 7.0 m/s^2 and that of the second to be 9.0 m/s^2 . If the mass of the first particle is 6.3 x 10^-7 kg , what area) the mass of the second particle ?
b) the amount of charge on each particle ?
Physics Electrostatics Level: High School
What distance between point charge qa = 26.0 micro C and point charge qb = 47.0 micro C will the electrostatic force between them have a magnitude of 5.70 N ?