A 25 Cm-Long Horizontal Wire Segment Has a Mass of 0

question 67

Multiple Choice

A 2.5 cm-long horizontal wire segment has a mass of 0.15 g and carries a current sufficiently large that it levitates when the segment is in a region of uniform B field of magnitude 1.5 T. Assume that the B field is horizontal and perpendicular to the wire segment. The current is passed to the segment by way of massless electrical leads. What is the magnitude of the current in the wire?

• A) 39 mA
• B) 25 A
• C) 4.0 mA
• D) Not enough information is given.

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