A Little Magnetic Compass Has a Needle Whose Tips Are

question 3

Multiple Choice

A little magnetic compass has a needle whose tips are clearly labeled N and S. The compass is placed next to a single circular loop of wire lying flat on a wooden table. The current in the loop is clockwise. What happens?

• A) The S tip of the needle is attracted toward the loop.
• B) The N tip of the needle is attracted toward the loop.
• C) The needle orients itself with the N tip pointing in the direction of the current in the segment of the loop closest to the needle.
• D) The needle orients itself with the S tip pointing in the direction of the current in the segment of the loop closest to the needle.
• E) None of these.

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Definitions:

Binomial Probability

The probability of obtaining a specific number of successes in a fixed number of independent trials, with two possible outcomes.

Success

The accomplishment of an aim or purpose.

Probability Distribution

A function that describes the likelihood of obtaining the possible values that a random variable can assume.

Expected Value

The long-run average value of a random variable over numerous trials, a fundamental concept in probability.