If the Magnetic Field from a Long, Straight, Current-Carrying Wire

question 12

Multiple Choice

If the magnetic field from a long, straight, current-carrying wire has a magnitude B₀ at a distance d, what is the magnitude of the field at a distance 2d?

• A) also B₀
• B) 0.707 B₀
• C) 0.693 B₀
• D) B₀/2
• E) B₀/4

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Definitions:

Reversible Figures

Optical illusions or images that can be perceived in more than one way, demonstrating the brain's interpretative processes.

Figure-Ground

A principle in perception and visual psychology, where the viewer separates an object (the figure) from its surroundings (the ground).

Visual Illusion

A perception that misleadingly differs from reality, often due to the brain's interpretation of visual stimuli in a way that contradicts physical measurements.

Distal Stimulus

An object or event in the external world that provides the basis for the sensory input that is ultimately processed by the sensory receptors.