Which device consists of two separate coils of wire wrapped around an iron ring?
O A. A transformer
B. A generator
C. A motor
D. A commutator

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Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.

When an object is heated it contracts. a. true b. false