Find the average magnitude of the induced emf if the change

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Q. A small rock moves in water and the force exerted on it by the water is given by equation . The terminal speed of the rock is measured and found to be 1.9 . The rock is projected upward at an initial speed of 6.4 . You can ignore the buoyancy force on the rock.

Q. An emf is induced in a conducting loop of wire 1.16 m long as its shape is changed from square to circular. Find the average magnitude of the induced emf if the change in shape occurs in 4.17 s, and the local 0.128 T magnetic field is perpendicular to the plane of the loop.

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