Two Wires Are Made of the Same Material and Have

question 39

Multiple Choice

Two wires are made of the same material and have the same length but different radii.They are joined end-to-end and a potential difference is maintained across the combination.Of the following the quantity that is the same for both wires is:

• A)potential difference
• B)current
• C)current density
• D)electric field
• E)conduction electron drift speed

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Definitions:

Blood-brain Barrier

A protective barrier in the brain that controls the passage of substances from the bloodstream into the brain tissue.

Water-soluble Molecules

Compounds that can dissolve in water, typically involved in various biochemical processes in the body.

Mediated Transport

The process by which molecules are moved across a cell membrane with the assistance of specific proteins, including both active and passive transport mechanisms.

Cranial Nerve

One of twelve pairs of nerves that arise directly from the brain, not the spinal cord, and supply sensory and motor functions to the head and neck.