Question: A standard door into a house rotates about a vertical axis through one side, as defined by the doors hinges. A uniform magnetic field is

A standard door into a house rotates about a vertical axis through one side, as defined by the door’s hinges. A uniform magnetic field is parallel to the ground and perpendicular to this axis. Through what angle must the door rotate so that the magnetic flux that passes through it decreases from its maximum value to one-third of its maximum value?

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