Question: ( 5 % ) Current I runs through a rectangular loop in the following way, and the loop is placed in a uniform magnetic field

(5%) Current I runs through a rectangular loop in the following way, and the loop is placed in a uniform magnetic field vec(B)ext as shown below.
Find out how much work you have to do to turn the loop so that it lies horizontally.
( 5 % ) Current I runs through a rectangular loop

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