Question: A single loop of wire is placed around the circumference of a rectangular piece of cardboard whose length and width are 70 and 20 cm,

A single loop of wire is placed around the circumference of a rectangular piece of cardboard whose length and width are 70 and 20 cm, respectively. The cardboard is now folded along a line perpendicular to its length and midway between the two ends so that the two planes formed by the folded cardboard make an angle of 90o. If the wire loop carries a current of 0.2 A, what is the magnitude of the magnetic moment of this system?

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