Electric Field and Potential : the Graph in the Figure

question 32

Multiple Choice

Electric field and potential : The graph in the figure shows the variation of the electric potential V(x) (in arbitrary units) as a function of the position x (also in arbitrary units) . Which of the choices below correctly describes the orientation of the x-component of the electric field along the x-axis?

• A) E_x is positive from x = -2 to x = 2.
• B) E_x is positive from x = -2 to x = 0, and negative from x = 0 to x = 2.
• C) E_x is negative from x = -2 to x = 0, and positive from x = 0 to x = 2.
• D) E_x is negative from x = -2 to x = 2.

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Definitions:

Direct Labor Time Variance

The difference between the actual labor time spent on a product and the standard labor time expected, affecting product costs.

Standard Costs

Predetermined or estimated costs that are used as benchmarks for measuring the performance of actual costs in manufacturing or production.

Actual Costs

Actual costs are the real or true costs incurred for materials, labor, and overhead in the production of goods or provision of services, as opposed to estimated or standard costs.

Direct Labor Rate Variance

The difference between the actual cost of direct labor and the expected (or standard) cost, used to analyze labor cost efficiencies or inefficiencies during production.