1. The alternating electric current at a wall outlet is most commonly produced by (a) A connection...
Question:
(a) A connection to rechargeable batteries.
(b) A rotating coil that is immersed in a magnetic field.
(c) Accelerating electrons between oppositely charged capacitor plates.
(d) Using an electric motor.
(e) Alternately heating and cooling a wire.
2. When you swipe a credit card, the machine sometimes fails to read the card. What can you do differently?
(a) Swipe the card more slowly so that the reader has more time to read the magnetic stripe.
(b) Swipe the card more quickly so that the induced emf is higher.
(c) Swipe the card more quickly so that the induced currents are reduced.
(d) Swipe the card more slowly so that the magnetic fields don't change so fast.
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