A straight wire 11 m long carries 70µC distributed uniformly over its length. a)

Question

A straight wire 11 m long carries 70µC distributed uniformly over its length. a)What is the line charge density on the wire? ______________µC/m Make suitable approximations in both cases below.

b) Find the electric field strength 12 cmfrom the wire axis, not near either end. _____________ kN/C

c) Find the electric field strength 390 m from the wire. ______________ N/C


A straight wire 11 m long carries 70µC distributed uniformly over its length. a)What is the line charge density on the wire? ______________µC/m Make suitable approximations in both cases below.

b) Find the electric field strength 12 cmfrom the wire axis, not near either end. _____________ kN/C

c) Find the electric field strength 390 m from the wire. ______________ N/C

Explanation / Answer

Linear charge density = q / L                                        = 70C / 11m                                        = 6.3636C / m For an infinitely long wire theelectric field strength is           Ey =2ke / y substitute the values.

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