Practice Exam Answers

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25

A charge of 40 µC is pushed by a force of 15 µN a distance of 1 point 3 millimeters in an electric field. What is the electric potential difference?

A
2 point 0 times 10 to the negative 8 power cap v
B
4 point 9 times 10 to the negative 4 power cap v
C
4 point 6 times 10 to the negative 7 power cap v
D
3 point 8 times 10 inverse cap v
26

A force of 60 cap n is used to stretch two springs that are initially the same length. Spring A has a spring constant of 4 cap n over m , and spring B has a spring constant of 5 cap n over m How do the lengths of the springs compare?

A
Spring B is 1 m longer than spring A because 5 minus 4 is equal to 1 .
B
Spring A is 3 m longer than spring B because 15 minus 12 is equal to 3 .
C
Spring A is the same length as spring B because 60 minus 60 is equal to 0 .
D
Spring B is 60 m longer than spring A because 300 minus 240 is equal to 60 .
27

What are some applications of the field of spectroscopy? Choose five correct answers.

A
for identifying elements in a sample
B
for killing bacteria in foods
C
for producing neon lights
D
for determining types of chemical bonds
E
for use in medical imaging devices
F
for determining the distance and velocity of galaxies
28

What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B
It is magnetized by the field of the solenoid and increases the magnetic field strength.
C
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
D
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.

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Practice Exam Answers — Physics