Multiple Point-Charges: Two Point Charges of + 20

question 37

Multiple Choice

Multiple point-charges: Two point charges of + 20.0 μC and - 8.00 μC are separated by a distance of 20.0 cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

• A) 25.2 × N/C directed toward the negative charge
• B) 25.2 × N/C directed toward the positive charge
• C) 25.2 × N/C directed toward the negative charge
• D) 25.2 × N/C directed toward the positive charge
• E) 25.2 × N/C directed toward the negative charge

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Definitions:

Interaction Term

A variable in statistical models that captures the effect of two or more variables simultaneously affecting a response variable.

Significance Level

The probability of inappropriately disapproving the null hypothesis in a study of statistics, generally labelled as alpha.

Linearly Related

Shows a direct correlation between two variables in which the rate of increase or decrease in one variable is consistent with the rate in the other variable.

Indicator Variables

Indicator variables, also known as dummy variables, are used in statistical models to represent categorical data by assigning a binary value (usually 0 or 1) to each category.