Electricity and Magnetism Answers

In the figure, the particles have charges q1 = -q2 = 210 nC and q3 = -q4 = 92 nC, and distance a = 4.2 cm. What are the (a) x and (b) y components of the net electrostatic force on particle 3?

A simplified set of cross sections for Argon gas can be described as:
Elastic collision cross section Qel(E) = 1.59x10-19 m2 x E/E* if E<E* = 11.55 eV
= 1.59x10-19 m2 x sqrt(E*/E) if E>E* = 11.55 eV
Ionization cross section Qion(E) = 0 if E<Ei = 15.9 eV
= 3.18x10-20 m2 x log(E/Ei) x Ei/E if E>Ei = 15.9 eV
Assuming a Maxwell-Boltzmann distribution function for electrons, plot the following quantities as a
function of the electron temperature in a range from 1 to 10 eV for a plasma at 100 Pa and Tgas = 300K:
1) The average elastic collision frequency
2) The average ionization frequency

A disk with a uniform positive surface charge density lies in the x-y plane, centered on the

origin. The disk contains 2.5 x 10-6 C/m2 of charge, and is 7.5 cm in radius. What is the electric

field at z = 15 cm?

A disk with a uniform positive surface charge density lies in the x-y plane, centered on the
origin. The disk contains 2.5 x 10-6 C/m2
of charge, and is 7.5 cm in radius. What is the electric
field at z = 15 cm?

How an electric field inside the conductor is zero?

determine the magnitude and direction of the electric field at a point midway between a -8microC and a 5.8microC charge 6cm apart

A man uses a rock as a fulcrum and lifts a 300-kg boulder with a metal bar 6.00 m long. Calculare the force necessary to lift the boulder if the fulcrum is:
(a) 1.00 m from where the bar contacts the rock.
(b) 3.00 m from where the bar contacts the rock.

a proton with energy 1 Mev move perpendicular to the earth B field of 0.5 gauss or 0.00005T find radius&frequency of orbit?

A spherical balloon has a radius of R=73 cm, and its surface has been charged uniformly. You measure the electric field to be E =−Es*r at the balloon’s surface, where Es=25 kN/C.
(a) Calculate the field strength r1=45 cm from the balloon’s center.
(b) Calculate the field strength r2=192 cm from the balloon’s center.
(c) Calculate the net charge on the balloon.