A Bar (L = 80 Cm)moves on Two Frictionless Rails,as $\Omega$

question 6

Multiple Choice

A bar (L = 80 cm) moves on two frictionless rails,as shown,in a region where the magnetic field is uniform (B = 0.30 T) and into the paper.If v = 50 cm/s and R = 60 m $\Omega$ ,what is the magnetic force on the moving bar?

• A)0.48 N to the right
• B)0.48 N to the left
• C)0.32 N to the left
• D)0.32 N to the right
• E)None of the above

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Definitions:

Fixedness

A cognitive bias that limits a person to using an object only in the way it is traditionally used.

Heuristics

Mental shortcuts or rules of thumb that simplify decision making and problem solving, although not always perfectly accurate.

Creativity

The ability to produce original and unusual ideas, or to make something new or imaginative.

Sunk-Cost Fallacy

A cognitive error where past investments of time, effort, or money are taken into account when making a decision, even though they cannot be recovered.