The figure to the right shows the end view of a piece of house wiring. Equal cur

Question

The figure to the right shows the end view of a piece of house wiring. Equal currents flow in opposite directions. Select the Amperian path enclosing at least one wire such that   integral B · d? = 0 over the path.

(a) Path (a) (b) Path (b) (c) both Path (a) and Path (b) (d) neither Path (a) not Path (b)

2) The figure to the right shows a cross-section of a co-axial cable. A current I flows out of the page through the central wire. An equal current I flows into the page in the outer conductor. Both conductors are shown in grey. What is the total current flowing through the surface bounded by the dashed curve in the figure? This is the current you would use in Ampere’s law.

(a) 0 (b) I (c) 2I (d) I 2

Explanation / Answer

1. Path (a) as there is nullification f the two fields

2. (a) 0

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