ELECTRICITY AND MAGNETISM CA (PHYS2239)
BSc, Physics - PHYS
Semester: Second Semester
Level: 200
Year: 2018
REPUBLIC OF CAMEROON REPUBLIQUE DU CAMEROUN
Peace-Work-Fatherland Paix-Travail-Patrie
MINISTER OF HIGHER EDUCATION MINISTERE DE L’ENSEIGNEMENT SUPERIER
THE UNIVERSITY OF BAMENDA
UNIVERSITE DE BAMENDA
FACULTY OF SCIENCE
FACULTE DES SCIENCES
P.O. Box 39 Bambili
Tell: (+237) 22 81 63 50 Bambili : 21/02/ 2014
CONTROL ASSESMENT Of ELECTRICITY TIME: 2Hours ACADEMIC YEAR: 2017 - 2018
QUESTION I Determination of the Electric field 14 MARKS
Let consider the rod of length L describe by the Figure 1.
1) Determine the electric field at the P point located along x-axis considering that the charge per unit of length is X.
2) Deduce the electric field in the case where x»L and when L»x
B- Let consider the disk of radius R having the surface
charge density o (figure 2)
1) find the electric field at the P point located at the axis of the disk.
2? Deduce the electric field in the case where R>>z(infinite sheet of charge.)
3) find the electric potential V(z) with respect to V
o
when z=o and express the electric potential V(z) with respect to V
o
using
the expression coming from the result where /z/<<R.
QUESTION II: Relative electric field E and electric potential V. 4 marks
Let consider the electric potential given by: V(x,y,z) =x
2
y-z.
Determine the electric field in the Cartesian and cylindrical coordinate system.
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