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Q. A 15-{rm cm}-diameter CD has a mass of 22 g.

What is the CD's moment of inertia for rotation about a perpendicular axis through its center?

What is the CD's moment of inertia for rotation about a perpendicular axis through the edge of the disk?

Q.Two coils connected as shown in fighure separately has inductances L1 and L2. Their mutual inductance is M. Show that this combination is replaced by a single coil of equivalent inductance given by Leq = L1 + L2 + 2M. (b) how can the coils in the figure be reconnected to yield an equivalent inductance of Leq = L1 + L2 - 2M?

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