As Shown in the Figure, a Metal Bar Is in Contact

question 128

Multiple Choice

As shown in the figure, a metal bar is in contact with a pair of metal parallel rails. A steady uniform magnetic field B, perpendicular to the plane of the rails and pointing outward from the page, is present. The bar is in downward motion with velocity of magnitude ν. The direction of the induced current through the resistor R is

• A)from a to b.
• B)from b to a.
• C)No current is induced.

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Definitions:

Energy Metabolism

The set of chemical reactions that occur within a living organism to convert energy from food into a form that cells can use.

Neuropeptide Y

A neurotransmitter found in the brain and autonomic nervous system, involved in regulating a variety of physiological processes such as appetite, stress response, and circadian rhythms.

Leptin

A hormone produced by adipose (fat) cells that helps to regulate energy balance by inhibiting hunger.

Insulin

A hormone produced by the pancreas that regulates blood glucose levels by facilitating the uptake of glucose into tissues.