A spaceship encounters a single plane of charged particles, with the charge per

Question

A spaceship encounters a single plane of charged particles, with the charge per unit area equal to sigma. The electric field a short distance above the plane has magnitude___ and is directed___to the plane. A beam of electrons moves at velocity V_f. The number of particles per unit volume in the beam of area A is beta. If we imagine a cylindrical Gaussian surface of radius and length/centered on the beam, the electron flux through the surface is A uniform electric field E_1 is present in the region between infinite parallel plane plates A and B and a uniform electric field is present in the region between infinite parallel plane plates B and C. When the plates are vertical, is directed to the right and to the left. The signs of the charges on plates A,B and C may be

Explanation / Answer

1(a)  

d. E = /0

EdA = Q/0 = A/0 => since E is constant wrt to A, E = /0 above the plane. If is negative, the E field is directed into the plane and vice versa.

1(b)   ans. is e

1(c)

ans. is c)

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