Physics - solenoid problem.
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Physics - solenoid problem.

[From: ] [author: ] [Date: 11-05-25] [Hit: ]
20 m can generate a magnetic field of 12.0 T in its core when its coils carry a current of 135 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K.......
Im having a lot of trouble understanding this question and getting the answer. Not sure what the temperature it cools down to has to do with it. Please can someone help! thankyou

A certain superconducting magnet in the form of a solenoid of length 1.20 m can generate a magnetic field of 12.0 T in its core when its coils carry a current of 135 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K. Find the number of turns in the solenoid

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The information you need you can find here: http://en.wikipedia.org/wiki/Solenoid

You do not need the temperature to solve the equation. That information is just added to make you think more about what information you really need.
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