The primary advantage of a rotating anode in some X-ray imaging systems is to dissipate heat. This allows for higher power X-ray applications whereby heat is distributed evenly, thus enabling the tube to handle more heat without suffering damage. The electromagnetic induction coil used in rotating anodes, has an area of 48.6 cm² and 200 turns, and is rotated clockwise in a constant magnetic field of magnitude 2.40 T. Refer to the diagram below: Ꮎ N The graph below shows how the induced emf (ε) varies with the inverse of time () (V) ε 3 2 1 0 1 1 2 3 ΔΙ (S-1) 6.4.1 Use the information in the graph to calculate the change in magnetic flux. (3) 6.4.2 The coil rotates through an angle 0 to a position where the magnetic flux becomes zero. Calculate the angle 0. (3)

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