Magnetic Force + Wires

[stryker123]

1. The problem statement, all variables and given/known data
A packed bundle of 100 long, straight, insulated wires forms a cylinder of radius R=.5cm

a. if each wire carries 2A, what are the magnitude and direction of the magnetic force per unit length acting on a wire located .2cm from the center of the bundle?



2. Relevant equations

B = μoI / 2(pi)r
???

3. The attempt at a solution
I found B to be .008T. but now I don't know what to do.

[stunner5000pt]

a packed bundle of wires that form a cylinder is a solenoid - thus you will ahve to find the magnetic field of a solenoid, and not that of a straight line ,as you have found

[Meir Achuz]

a packed bundle of wires that form a cylinder is a solenoid - thus you will ahve to find the magnetic field of a solenoid, and not that of a straight line ,as you have found
No. It is a straight wire.

[Meir Achuz]

Just use F/L=IXB.

[stunner5000pt]

No. It is a straight wire.

my mistake
i thought the wires curved to form a cylinder but instead we have a cylindrical bundle of parallel wires