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 Electromagnetic Induction MCAT Study Guide

1 .

The following information pertains to questions 1-5.

A flat 10 turn circular coil of radius Ro is positioned in space so that the normal to the plane of the coil is parallel to the magnetic field in the space. The magnetic field is uniform in the space occupied by the coil and changes with time as depicted in the figure at the right.

The emf induced in the coil was constant and nonzero throughout the time interval labeled ___.

 A B C D E

2 .       The emf induced in the coil was constant and zero throughout the time interval labeled ___.

 A B C D E

3 .       Comparing the magnitude of the average emf induced in the coil for each of the five time intervals, the magnitude of the average emf induced in the coil was greatest for the time interval labeled ___.

 A B C D E

4 .       The polarity of the induced emf in the coil ___ change during time interval B.

 did did not

5 .       The polarity of the induced emf in the coil ___ change during time interval C.

 did did not

6 .

The following information pertains to questions 6-10.

The magnetic flux directed perpendicular to the plane of a flat circular coil with radius Ro and no turns varies with time as in the figure at the right.

The instantaneous emf induced in the coil is constant and zero throughout the time interval labeled ___.

 A B C D E

7 .       The average emf induced in the coil is greatest for the time interval labeled ___.

 A B C D E

8 .       The maximum value of the magnitude of the instantaneous emf induced in the coil occurred during the time interval labeled ___.

 A B C D E

9 .       The polarity of the induced emf in the coil changed ___ times throughout the entire time interval represented by the graph.

 O 1 2 3 4 5

10 .       The magnitude of the average emf induced in the coil during time interval A is ___ the magnitude of the average emf induced in the coil during time interval C.

 equal to less than more than incomparable, without additional information, with

11 .       For an ideal, step up transformer, the voltage across the secondary winding is ___ the voltage across the primary winding.

 less than equal to more than incomparable with

12 .       For an ideal, step up transformer, the number of turns in the secondary winding is ___ than the number of turns in the primary winding.

 more than less than equal to incomparable with

13 .       For an ideal, step up transformer connected to a small load, the power delivered to the load is ___ the power delivered to the primary of the transformer.

 more than less than equal to incomparable with

14 .       For an ideal, step down transformer connected to a small load, the current flowing in the secondary winding is ___ the current flowing in the primary winding.

 less than equal to more than incomparable with

15 .

The following information pertains to questions 15 and 16.

In the figure at the right, the emf induced in a coil as the coil is rotated in a magentic field is plotted as a function of time. The equation which describes the voltage is

v(t) = Vosin (2pt / T).

In the above equation described by the curve in the figure, the numerical value for the parameter Vo is ___ volts.

 7.1 -7.1 10 14 -14 20

16 .       In the above equation, the numerical value of the parameter T is ___ sec.

 0 2.5 5 10 20

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