- #1

yjk91

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## Homework Statement

A total of 3.22 106 electrons are placed on an initially uncharged wire of length 1.29 m.

(a) What is the magnitude of the electric field a perpendicular distance of 0.396 m away from the midpoint of the wire?

(b) What is the magnitude of the acceleration of a proton placed at that point in space?

## The Attempt at a Solution

A total of 2.82 * 10^6 electrons are placed on an initially uncharged wire of length 1.34 m.

(a) What is the magnitude of the electric field a perpendicular distance of 0.404 m away from the midpoint of the wire?

so i did

2.82 X 10^6 electrons X 1.6 X 10^-19 C = 4.512 * 10 ^-13 = q

then i used E = K*q / r^2

E = 2 integral( k*q / r^2, min .404, max .78 (the hypot))

and got 0.00969 but the answer is 0.0128 n/C

mmm a little offf any suggestions?

(b) What is the magnitude of the acceleration of a proton placed at that point in space?

Newtons famous law Force = mass*accel

Look up the mass of a proton

a = F/m

does this look right?