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Electricity and Magnetism
A neutral object becomes negatively charged when rubbed with hair because the neutral object ___________
Select one:
a. gains protons
b. loses electrons Incorrect
c. gains electrons
d. loses protons
Select one:
a. gains protons
b. loses electrons Incorrect
c. gains electrons
d. loses protons
Electricity and Magnetism
Three identical metal spheres are hung from silk threads so that they are isolated from their surroundings. Initially, they are neutral in charge. A positively charged rod is touched to sphere A, sphere A is then touched to sphere B, and sphere B is touched to sphere C. If the charge on the rod was initially 20 C, .
Which of the three spheres has the most protons?
If all three spheres are briefly and simultaneously touched together, then what will be the resulting charge on sphere B?
What is the charge of sphere B after it has been touched to sphere C?
Which of three spheres has the least electrons after sphere B touched to sphere C?
Total charge that is distributed among the 3 spheres?
Charge on sphere A after it is touched to sphere B?
Smallest charge that any of the 3 spheres can have after all of the spheres are carrying a charge?
Charge on sphere C after it has been touched by sphere B?
Charge on sphere A after it is touched by the rod?
Which of the three spheres has the most protons?
If all three spheres are briefly and simultaneously touched together, then what will be the resulting charge on sphere B?
What is the charge of sphere B after it has been touched to sphere C?
Which of three spheres has the least electrons after sphere B touched to sphere C?
Total charge that is distributed among the 3 spheres?
Charge on sphere A after it is touched to sphere B?
Smallest charge that any of the 3 spheres can have after all of the spheres are carrying a charge?
Charge on sphere C after it has been touched by sphere B?
Charge on sphere A after it is touched by the rod?
Electricity and Magnetism
How much work is done to transfer 2.6 C of charge through a potential difference of 120 V?
Electricity and Magnetism
A force of 0.037 N is required to move a charge of 35.9 µC a distance of 24 cm in an electric field. What is the size of the potential difference between the two points?
Electricity and Magnetism
A metal ball has - 8 Coulomb of charge. If it receives 0.50*10^20 number of electrons, what will be the resultant charge of the ball?
Electricity and Magnetism
Derive the wave equation for the z-component of the electric field of an electromagnetic
wave and show that the wave propagates in free space with the speed of light .
wave and show that the wave propagates in free space with the speed of light .
Electricity and Magnetism
Why do magnetic moments in ferromagnetic materials, tend to align parallel to each other?
Establish the relation B = μ0(H + M), for a ferromagnetic material.
Establish the relation B = μ0(H + M), for a ferromagnetic material.
Electricity and Magnetism
A particle carrying charge q enters a magnetic field B with velocity v at an angle
Θ≠0≠90° . Show that it follows a helical path. Determine the radius of the helix.
Θ≠0≠90° . Show that it follows a helical path. Determine the radius of the helix.
Electricity and Magnetism
A copper wire of diameter 1 mm and length 30 m is connected across a battery of 2V.
Calculate the current density in the wire and drift velocity of the electrons. The resistivity
of copper is 1.72 ×10^–8Ωm and n = 8.0 ×10^28 electrons m^–3.
.
Calculate the current density in the wire and drift velocity of the electrons. The resistivity
of copper is 1.72 ×10^–8Ωm and n = 8.0 ×10^28 electrons m^–3.
.
Electricity and Magnetism
A glass of relative permitivity 4 is kept in an external electric field of magnitude 10^2 Vm^–1
.
Calculate the polarisation vector, molecular/atomic polarisability and the refractive index
of the glass
.
Calculate the polarisation vector, molecular/atomic polarisability and the refractive index
of the glass
