A Solenoid with 400 Turns Has a Radius of 0

question 15

Multiple Choice

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field near the center of the solenoid? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A) 16 mT
• B) 4.9 mT
• C) 15 mT
• D) 6.0 mT
• E) 9.0 mT

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