A Straight 15

question 7

Essay

A straight 15.0-g wire that is 2.00 m long carries a current of 8.00 A.This wire is aligned horizontally along the west-east direction with the current going from west to east.You want to support the wire against gravity using the weakest possible uniform external magnetic field.
(a)Which way should the magnetic field point?
(b)What is the magnitude of the weakest possible magnetic field you could use?

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