Question: 1. If there is induced current in Question 18 (see Fig. 21-51), wouldn't that cost energy? Where would that energy come from in case (a)?

1. If there is induced current in Question 18 (see Fig. 21-51), wouldn't that cost energy? Where would that energy come from in case (a)?
(a) Induced current doesn't need energy.
(b) Energy conservation is violated.
(c) There is less kinetic energy.
(d) There is more gravitational potential energy.
2. A non-conducting plastic hoop is held in a magnetic field that points out of the page (Fig. 21-54). As the strength of the field increases,
(a) An induced emf will be produced that causes a clockwise current.
(b) An induced emf will be produced that causes a counterclockwise current.
(c) An induced emf will be produced but no current.
(d) No induced emf will be produced.

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