A Long Wire Carries a Current of 3

question 39

Multiple Choice

A long wire carries a current of 3.0 A along the axis of a long solenoid (radius = 3.0 cm, n = 900 turns/m, current = 30 mA) . What is the magnitude of the magnetic field at a point 2.0 cm from the axis of the solenoid? Neglect any end effects.

• A) 34 μT
• B) 64 μT
• C) 30 μT
• D) 45 μT
• E) 4.0 μT

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