Electricity and Magnetism Answers

1.  Three charged particles are arranged in a line as shown in figure below. Charge A = -5 μC, charge B = +10 μC and charge C = -12 μC.  

a.  Calculate the net electrostatic force on particle A due to the other two charges.

b.  Calculate the net electrostatic force on particle B due to the other two charges.

c.   Calculate the net electrostatic force on particle C due to the other two charges 

1. Compute for the amount of charge (q) of a 15 V battery with -45 J potential energy
2. A metal sphere has 5x10^-9C static charge. Compute the voltage if the radius is equal to 0.05m. (k=8.99 x 10^9 N.m^2/C^2
3. Find the Total capacitance of the three given capacitors in series connection, given their individual capacitances, 4.0 μF, 15.0 μF.
4. Find the net capacitance of the three given capacitors connected in parallel, given their individual capacitances, 2.0 μF, 5.0, μF, 8.0 μF.
5. A parallel plate capacitor was placed 0.002 m apart. Compute for the capacitance if the area each plate is equal to 0.025 m^2. (ε0 = 8.85x10^-12 F/m)

A spherical ball has a radius of 0.2 m and electric charge is 20uc in its center.Calculate the electric flux pass through the spherical ball.

A copper wire has a resistance of 15.0 at a temperature of 14 degrees * C . After a current passes through the windings, the resistance rose to 22.5 ohms. To what temperature was the wire heated?

Two small spheres spaced apart have equal charge. How many electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 N?

1. two charged spheres q1 = 2.00x10^11 C; and q2=-5.00x^-8C are held fixed at positions 0.0500m apart. Calculate the magnitude of each electrostatic force between two spheres
2. Determine the electric flux of an electric field E = 2000 N/C with an area of 10m^2 and 45 degree angle
3. compute for the amount of charge (q) that passes through a conductor in 10 seconds with the amount of current equal to 20 a.

Two parallel wires are separated by a distance of 0.05 m. Wire 1 carries a

carries current of 12.0 A. Wire 2 carries a current of 6.0 A flowing in the

opposite direction as shown in the illustration.

Find the

(a) magnitude and

direction of the magnetic field created by wire 1 at wire 2,

(b) force exerted

by wire 1 on the 2.0 m long section of wire 2, and

(c) force exerted by wire 2

on wire 1.

4.) Two parallel wires are separated by a distance of 0.05 m. Wire 1 carries a carries current of 12.0 A. Wire 2 carries a current of 6.0 A flowing in the opposite direction as shown in the illustration. Find the (a) magnitude and direction of the magnetic field created by wire 1 at wire 2, (b) force exerted by wire 1 on the 2.0 m long section of wire 2, and (c) force exerted by wire 2 on wire 1.

5.) What should be the length of an ideal solenoid consisting of 1250 turns for the magnetic field in its interior to be 0.025 T? A current of 2.0 A is flowing through the solenoid.

1.) A proton moves through a uniform magnetic field of magnitude 2.0 µT=2.0 x 10^6 T at a speed of 5.00 x 10^6 m/s. (a) What is the magnitude of maximum magnetic force it can experience?

(b) If the proton is replaced by an electron, will it experience the same maximum force?

2.) A 55.0 m wire carries a current of 2.25 A in a location where Earth's magnetic field is 4.5 x 10^3 T. The wire experiences a force of 0.15 N. Find the angle between the wire and the magnetic field.

3.) A long straight wire carries a current of 1.0 A.

(a) At what distance from the wire is the magnitude of the magnetic field equal to 2.5 x 10^-5 T?

(b) What is the magnitude of the magnetic force that this wire will exert on a 3.0 nC particle moving at 4.2 x 10^4 m/s perpendicular to the field at that distance?

Radiation with a frequency of 7.52 × 1014 Hz illuminates a photoelectric surface in a photoelectric cell. If the work function of this surface is 2.20 eV, what is the maximum kinetic energy of the emitted electrons, and what stopping voltage would be required to reduce the current through this cell to zero?