457. Problem 35.5 (RHK) A long straight wire carries a current of 48.8 A.
An electron, travelling at
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Solution: Click For PDF Version We fix a coordinate system as shown in the figure. Flow of current in the
long straight wire is in
Direction of the vector is along the tangent to the circumference of the circle and therefore for answering the problem we fix it as
We now consider the three parts of the problem one-by-one. (a) Electron moving with speed
Its charge is
Force on a charge, e, moving with velocity
Therefore, Force on the electron is in the same direction as that of the current in the wire. (b) Electron is moving parallel to the current. Its velocity will be Therefore, The direction of the force is radially outward. (c) Direction at right angles to
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