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Q. A 7.4 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.68 T pointing up. During the course of 0.13 s, the field is changed to one of 0.25T pointing down. What is the average induced emf in the coil?

Q. A person whose eyes are 1.76 m above the floor stands 2.7 m in front of a plane mirror whose bottom edge is 24 cm above the floor. What is the horizontal distance x (in metres) to the base of the wall supporting the mirror of the nearest point of the floor that can be seen reflected in the mirror?

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