In the Figure, a Straight Wire Carries a Steady Current

question 20

Multiple Choice

In the figure, a straight wire carries a steady current I perpendicular to the plane of the page. A bar is in contact with a pair of circular rails, and rotates about the straight wire. The direction of the induced current through the resistor R is

• A) from a to b.
• B) from b to a.
• C) There is no induced current through the resistor.

---

Definitions:

Symbolic Thinking

The ability to use symbols, words, or objects to represent something that is not physically present.

Preoperational Child

A stage in Piaget's theory of cognitive development describing children aged 2 to 7, characterized by the development of language and symbolic thought but limited in logical reasoning.

Conservation

In cognitive psychology, the principle that properties of substances such as weight and mass remain the same (are conserved) when superficial characteristics such as their shapes or arrangement are changed.

Irreversibility

A cognitive concept where an individual does not understand that actions can be reversed to return to the original state.