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 the axis. Through what angle must the door rotate so that the magnetic flux that passes through it decreases from its maximum value to 1/4 of its maximum value?

Question

Physics

Alonso Haas

9 December, 04:05

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 the axis. Through what angle must the door rotate so that the magnetic flux that passes through it decreases from its maximum value to 1/4 of its maximum value?

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Answers (1)

Know the Answer?

Nikolas Clay · Answer 1

75.5degrees

Explanation:

Magnitude of magnetic flux = BA

If rotated through an angle = BAcos theta

= (0.25) BA=BAcos theta

= costheta = 0.25

= theta = cos^-1 0.25

=75.5degrees