Two Solenoids Are Each Made of 2 000 Turns of Copper

question 61

Multiple Choice

Two solenoids are each made of 2 000 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 B_I along the axis of solenoid I to 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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