An Electron Is Moving at 3

question 30

Multiple Choice

An electron is moving at 3.0 × 10⁶ m/s perpendicular to a uniform magnetic field. If the radius of the motion is 18 mm, what is the magnitude of the magnetic field?

• A) 70 mT
• B) 0.95 mT
• C) 9.3 mT
• D) 1.6 μT
• E) 8.9 nT

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Definitions:

Oral Contract

An agreement between parties that is made verbally instead of being documented in writing.

Admission

A statement made in court, under oath, or at some stage during a legal proceeding in which a party against whom charges have been brought admits that an oral contract existed, even though the contract was required to be in writing.

Equal Dignity Rule

A legal principle requiring that agents’ actions and contracts signed on behalf of a principal must be in writing if the principal's contract is also required to be in writing.

Statute of Frauds

A legal principle requiring certain types of contracts to be in writing and signed by the party to be charged, in order to be enforceable.