Two Parallel Long Wires Carry the Same Current and Repel

question 22

Multiple Choice

Two parallel long wires carry the same current and repel each other with a force F per unit length.If both these currents are doubled and the wire separation tripled, the force per unit length becomes:

• A)2F/9
• B)4F/9
• C)2F/3
• D)4F/3
• E)6F

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Definitions:

Efficient Portfolios

Investment portfolios designed to achieve the highest possible return for a given level of risk.

Standard Deviation

A measure of the dispersion or variability of a set of data points around the mean value, used in statistics and finance.

Correlation Coefficient

A statistical measure that calculates the strength and direction of a linear relationship between two variables on a scatterplot.

Covariance

A statistical measure of the directional relationship between the returns of two assets.