Astraight, nonconducting plastic wire 9.50 cm long carries a charge density of 130 nc/m distributed uniformly along its length. it is lying on a horizontal tabletop. a) find the magnitude and direction of the electric field this wire produces at a point 4.50 cm directly above its midpoint. b)if the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 4.50 cm directly above its center.

A) E = 3.70*10^{4} N/C

B)  E = 2.281*10^3 N/C

Explanation:

given data:

charge density

length of wire = 9.50 cm

a) at x  = 4.5 m above midpoint, electric field is calculated as

x = 4.5 cm

midpoint a = 4.5 cm = 0.0475 m

E = 3.70*10^{4} N/C

B) when wire is in circle form

   = 1.235*10^{-8} C

Radius of circle

r = 1.511*10^{-2} m

E = 2.281*10^3 N/C

the answer is d. 4

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i think the answer is a and b

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