Electricity and Magnetism Answers

A positive charge Q1 = +250.0 μC is located at a point X1 = -2.00 m, a negative charge Q2 = -150.0 μC is located at a point X2 = 3.00 m and a negative charge Q3 = -200.0 μC is located at a point X3 = 6.00 m.a. Draw free body diagrams for the electric force acting on Q1, Q2 and Q3.b. Find the magnitude of the force between Q1 and Q2.c. Find the magnitude of the force between Q1 and Q3.d. Find the magnitude of the force between Q2 and Q3.e. Find the magnitude and direction of the net electric force on charge Q1.f. Find the magnitude and direction of the net electric force on charge Q2.g. Find the magnitude and direction of the net electric force on charge Q3.

The loss of energy due to hysteresis when 5kg of iron is subjected for 1hour to cylic magnetic changes of frequency 25cycles/sec, if the hysteresis loop represents a loss of 2500ergcm^(-3)cyclic^(-1) and density of iron is 7.8gmcm^(-3) is (in jouls)?

Two coils have mutual inductance of 3.25 x 10-4
. The current in the first coil
increases at a rate of 830 A/s. What is the magnitude of the induced emf in the coil?

Current flows south in a wire in a magnetic field that is directed vertically upward.
a) Sketch the situation described above.
b) In what direction is the force?


An electron traveling east enters a magnetic field that is directed downward.
a) Sketch the situation described above.
b) Sketch the resulting path of the electron

Determine the force between two electrons at (a) 10^-10 m apart (b) 10 ^-15 m apart (c) 10 ^-20 apart .
Is the force attarctive or repulsive ? If we take a proton and electron what would be the change in the magnitude and direction of force ?

Two point charges are 50 m apart. Their combined value is 20 C . What are the magnitudes of the charges if one pepels other with a force of a) 75 N (b) 7.5N (c) 0.75 N

If the circuit I is in phase 0= 0, what is the name of this circuit?

Describe an electronmagnetic wave?

Two small charged spheres are 6.52cm apart. They are moved and the force each exerts on the other is found to have tripled. How far apart are they now?

Suppose that earth has a surface charge density of 1 electron/m*2.calculate earth's potential and electric field just outside earth's surface.Radius of earth 6400km.