Two Solenoids of Equal Length Are Each Made of 2000

question 29

Multiple Choice

Two solenoids of equal length are each made of 2000 turns of copper wire per meter. Solenoid I has a 5.00 cm radius; solenoid II a 10.0 cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field B_I along the axis of solenoid I to the magnitude of the magnetic field B_II along the axis of solenoid II, B_I/B_II, is

• A) 1/4.
• B) 1/2.
• C) 1.
• D) 2.
• E) 4.

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