In the picture below are shown a long wire carrying a current I to the right and

Question

In the picture below are shown a long wire carrying a current I to the right and a long amber rod with a charge density (charge/unit length) of ?. Assume I and ? are both positive.

(A) The two are separated by a distance d. The point marked ? is half-way between them. Replicate the diagram and, draw arrows to represent the following. (Be sure to label your arrows clearly so we can tell which one is which.)

- the direction of the magnetic field at the point marked ?.

- the direction of the electric field at the point marked ?

- the direction of the electric force that a charge q placed at ? would feel

- the direction of the magnetic force that a charge q placed at ? would feel if it were moving to the right.

Explanation / Answer

a)direction of magnetic field is in to the page

d)direction of the magnetic force that a charge q placed at × would feel if it were moving to the right is

downward(from rhs rule,)f=q vXB

b)direction of the electric field at the point marked × is upwards

c) direction of the electric force that a charge q placed at × would feel is upward   

(+ve charges repel))

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