Question

1. A conducting slab with thickness, l, is placed un an uniform electric field E such that the field is perpendicular to the faces of hte conductor as drawn. The field in the conductror is naturally zero. What is the magnitude of the work required to move a particle with charge +q form the left surface of the slab to the right surface?

a. 0 b. qE c. qEl d. q^2E e. q^2El

2. The electric potential energy of a particle of charge q in the presence of a particle of charge q' is U if the particles are a distance r apart. If the distance between the particles is changed to 4r, what is the potential energy of q?

a. U/16 b. U/4 c. 4U d. 16U e. U

Answer 1

1. A conducting slab with thickness, l, is placed un an uniform electric field E such that the field is perpendicular to the faces of hte conductor as drawn. The field in the conductror is naturally zero. What is the magnitude of the work required to move a particle with charge +q form the left surface of the slab to the right surface?

d. q^2E

2. The electric potential energy of a particle of charge q in the presence of a particle of charge q' is U if the particles are a distance r apart. If the distance between the particles is changed to 4r, what is the potential energy of q?

a. U/16 b.