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.

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Definitions:

Antigenic Drift

Describes natural selection on seasonal influenza viruses that alters the structure of surface proteins, allowing them to evade the antibody-mediated immunity induced during previous infections or vaccinations.

Flu Vaccine

A vaccination that protects against the influenza virus, redeveloped each year to combat the seasonally evolving strains.

Resistance

Resistance refers to the capacity of pathogens to defend against antibiotics or other drugs.

Evolutionary Mismatch

The concept that existing genetic traits are no longer advantageous because they evolved for past environments that differ from current ones.