Exercise 5-4: A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A in the +x direction. If the wire is placed in a uniform magnetic flux density B, what should the direction and minimum magnitude of B be in order to magnetically lift the wire vertically upward? [Hint: The acceleration due to gravity is g = −ˆz 9.8 m/s2 . ] Answer: B = ˆy0.49 T.

Exercise 5-4: A horizontal wire with a mass per unit

length of 0.2 kg/m carries a current of 4 A in the

+x direction. If the wire is placed in a uniform magnetic

flux density B, what should the direction and minimum

magnitude of B be in order to magnetically lift the wire

vertically upward? [Hint: The acceleration due to gravity

is g = −ˆz 9.8 m/s2

.

]

Answer: B = ˆy0.49 T.

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