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## Homework Statement

Problem 27.7

A stiff wire 52.0 cm long is bent at a right angle in the middle. One section lies along the z axis and the other is along the line y=2x in the plane. A current of 20.5 A flows in the wire-down the z axis and out the line in the xy plane. The wire passes through a uniform magnetic field given by B=(0.318i)T .

(a) : Determine the magnitude and direction of the total force on the wire.

(b) : Find the ange theta = ,,,,,, below the negative y-axis

## Homework Equations

F = I l B sin(theta)

F = I lxB

## The Attempt at a Solution

Length L = 35(2) *(-k) +35(2) cos 65 i + 35(2) sin 65 j

= 29.58 i + 63.44 j - 70 k

magnetic field B = 0.318 i

current i = 20.5 A

force F = i ( L X B )

but there is some thing wrong !!

i don't know wher ,, maybe with the angle theta !!

Please help and thanks for trying to help me .