Question Checkup 30.2.3: A wire hangs in a horizontal magnetic field, held taut by a ......

Physics for Engineers and Scientists Volume 2 [1423312]

A wire hangs in a horizontal magnetic field, held taut by a weight (see Fig. 30.12). We connect this wire to a battery, so a current flows vertically upward. The deflection of the hanging wire will be

(A) To the right (B) To the left (C) Into the page (D) Out of the page (E) Zero

F30.12

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B) To the left. From $F = IL \times B$ , we see from the righthand rule that the cross product of an upward current with a field into the page in Fig. 30.12 gives a force that is to the left.

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