Question

A thin wire is bent to form a rectangle whose straight sides are long a [m]...

A thin wire is bent to form a rectangle whose straight sides are long
a [m] and 2a [m], and a current of i [A] flows through it. Calculate the modulus of the magnetic field in
the center of the rectangle. (help: the magnetic field can be calculated as the sum of the contribution
of each of the three straight wires)

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