A Conducting Bar Slides Without Friction on Two Parallel Horizontal

question 77

Multiple Choice

A conducting bar slides without friction on two parallel horizontal rails 50 cm apart. The resistance of the bar and the rails is assumed to be constant and equal to 0.1 Ω. A uniform magnetic field is perpendicular to the plane of the rails. A force F = 0.08 N is required to keep the bar moving at a constant speed of 0.5 m/s. What is the magnitude of the magnetic field?

• A)0.1 T
• B)0.25 T
• C)0.36 T
• D)0.54 T
• E)0.93 T

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Definitions:

Renal Papilla

The apex of the renal pyramid which projects into the lumen of the minor calyx in the kidney, where urine is funneled into the ureter.

Simple Squamous Epithelium

A single layer of flat cells that facilitates diffusion and filtration processes in tissues.

Transitional Epithelium

A type of epithelial tissue that can stretch and change its number of layers, found mostly in the urinary tract.