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Two solenoids are each made of 2000 turns of copper wire per metre. Solenoid 1 is 2 m long, while solenoid 2 is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field 81 along the axis of solenoid 1 to the magnetic field 82 along the axis of solenoid 2 is?
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Added Fri, 07 Aug '15
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B = UNI

so if current is same, B1/B2 = N1/ N2

so B1/B2 = 2*2000/1*1000 = 2
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Added Fri, 07 Aug '15
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