Two Solenoids of Equal Length Are Each Made of 2000

question 1

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 BI along the axis of solenoid I to the magnitude of the magnetic field BII along the axis of solenoid II, BI/BII, is

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

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