(a) The resistance per unit length (R/L) of a round-shaped wire of diameter 4 mm is20/km. If a current of 20 A flows through the wire, find(i) The conductivity of the wire(ii) The current density in the wire.[14](b) A sphere of radius a and dielectric constant e, has a point charge Q at its center.Dielectric constant outside of the sphere is 1.(i) Find electric field inside and outside of the sphere.(ii) Find the potential at the surface of the sphere.(iii) Find the potential at the center of the sphere.[10+12+8 = 30](c) Consider a dielectric-dielectric interface, the dielectric constants e,1 = 3 and e,r2 =1.5. Eį = 8 V/m and D1, = 4 C/m². Charge density at the interface is 1 C/m². Findthe following(i) E2t(iii) D2n[16]

Since we only answer one question at a time. we’ll answer the first question only.Please resubmit…

(a) The resistance per unit length (R/L) of a round-shaped wire of diameter 4 mm is 20/km. If a current of 20 A flows through the wire, find (i) The conductivity of the wire (ii) The current density in the wire. [14]

(a) The resistance per unit length (R/L) of a round-shaped wire of diameter 4 mm is 20/km. If a current of 20 A flows through the wire, find (i) The conductivity of the wire (ii) The current density in the wire. [14]

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

(a) The resistance per unit length (R/L) of a round-shaped wire of diameter 4 mm is
20/km. If a current of 20 A flows through the wire, find
(i) The conductivity of the wire
(ii) The current density in the wire.
[14]
(b) A sphere of radius a and dielectric constant e, has a point charge Q at its center.
Dielectric constant outside of the sphere is 1.
(i) Find electric field inside and outside of the sphere.
(ii) Find the potential at the surface of the sphere.
(iii) Find the potential at the center of the sphere.
[10+12+8 = 30]
(c) Consider a dielectric-dielectric interface, the dielectric constants e,1 = 3 and e,r2 =
1.5. Eį = 8 V/m and D1, = 4 C/m². Charge density at the interface is 1 C/m². Find
the following
(i) E2t
(iii) D2n
[16]

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