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Question 2 of 36

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SAT Subject Test

The set of lettered choices below refers to multiple questions. Select the one lettered choice that best answers each question. A choice may be used once, more than once, or not at all in each set.

Which graph best represents the magnetic field measured at the center of a coil due to a steady current as a function of time?

Select an Answer

Each option presents a graph. The horizontal axis is labeled Time. The origin is labeled O.  The plot is a straight line starting at the origin and extending diagonally upward to the upper right area.

Correct Answer: 
No

A graph shows a single sinusoidal wave, starting at the origin and extending along the horizontal axis.

Correct Answer: 
No

The plot shows a straight line parallel to the horizontal axis, starting at a point more than halfway up the vertical axis and extending to the right.

Correct Answer: 
Yes

A blank graph is shown.

Correct Answer: 
No

A concave up curve is shown starting near the top of the vertical axis of the graph. The curve slopes steeply down and to the right and approaches a horizontal line near the horizontal axis.

Correct Answer: 
No

The correct answer is a steady non-zero magnetic field. The magnetic field at the center of a coil is directly proportional to the current in the coil. If the current remains constant over time so does the magnetic field.

Question Difficulty: 
medium