An Electron Moves Through a Region of Crossed Electric and Magnetic

question 62

Multiple Choice

An electron moves through a region of crossed electric and magnetic fields. The electric field E = 3200 V/m and is directed straight down. The magnetic field B = 0.80 T and is directed to the left. For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force?

• A) 2500 m/s
• B) 5000 m/s
• C) 4000 m/s
• D) 8000 m/s

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Definitions:

Effective Price Ceiling

A government-imposed limit on the price charged for a product, intended to keep prices below what they would be in a free market, and effectively enforced to achieve its goal.

Government Setting

The context or environment in which government policies, decisions, and operations are executed.

Price Of Pencils

The amount of money required to purchase a pencil, which can vary based on factors such as quality and brand.

Price Floor

A government- or authority-imposed minimum price that can be charged for a good or service, intended to prevent the market price from falling below a certain level.