Two Solenoids Are Each Made of 2000 Turns of Copper

question 68

Multiple Choice

Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to 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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