P29_052 - 52. (a) We use = B , where points into the wall...

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52. (a) We use = × ~ B , where points into the wall (since the current goes clockwise around the clock). Since ~ B points towards the one-hour (or “5-minute”) mark, and (by the properties of vector cross products) must be perpendicular to it, then (using the right-hand rule) we Fnd
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