PHYS 165 Module 9 Exam Questions Answered Correctly Rated A+
Which type of magnetic pole is located in the Northern Hemisphere of the Earth? - Answers
South Magnetic Pole
What is a region of space where a ferromagnetic substance will have a magnetic force acting
on it called?
A) A Magnetic Pole
B) A Magnetic Domain
C) A Magnetic Flux
D) Magnetic Field - Answers D) Magnetic Field
What is the name of an electric device that converts kinetic energy into electric energy? -
Answers *Generator*
A motor uses electrical energy to create motion
What is the name of an electric device that converts electric energy into kinetic energy?
A) Motor
B) Generator - Answers A) Motor
True or False: According to Lenz's Law, the direction of the Emf induced is *always opposite*
the changing magnetic field. - Answers True
What is the angle between Earth's magnetic field and *horizontal* called?
A) Magnetic Inclination
B) Magnetic Declination - Answers A) Magnetic Incliniation
What is the angle between the direction a compass needle points and geographic *North* called?
A) Magnetic Inclination
B) Magnetic Declination - Answers B) Magnetic Declination
Magnetism is a ___________________________. - Answers Field Force
What is the name of a device that has two coils of wire that are linked by their mutual magnetic
fields? - Answers Transformer
, True or False: When drawing magnetic field lines around the North pole of a bar magnet, they
should be drawn *away* from the North pole. - Answers True
True or False: If magnetic field lines are drawn away from one end of a bar magnet, then this
end of the bar magnet must be a South magnetic pole. - Answers False
When drawing magnetic field lines, if the *lines are getting closer together,* what does this
indicate about the strength of the magnetic field in this region?
A) The strength of the field is increasing.
B) The strength of the field is decreasing. - Answers A) The *strength* of the field is
*increasing*
close= strong
far = weak
A wire carries an electric current in a direction that is perpendicular to a magnetic field. Four
possible orientations are shown in Figure 9.T.6. Which orientation creates a force on the wire
that is to the right? - Answers The only drawing that fits if the one where I= pointing straight
down, field force is indicated straight into page, According to RHR Option has to point right
indicated by letter D
A 15.0-cm diameter coil of wire is inside a 0.521-T magnetic field. What Emf is induced when it
remains stationary for 15.0 s? - Answers *No Emf is induced* in this wire since there is no
change to create the Emf since it remains stationary.
A charged object moves at 475 m/s to the South through a magnetic field of 1.42 T, which is
directed to the East. If the charge of the object is +12.5 nC, what is the magnitude and direction
of the magnetic force acting on the object? - Answers Given: v= 475m/s , B= 1.42, q= 1.42 where
magnetic field directed east and object moving south = 90deg
F= |q|VBsin(90)
F= q(V x B)
= Q V x B Sin Ө
= (12.5x10^-9) x (475) x (1.42) Sin(90)
F= 8.43125x10^-6
*F= 8.43 x10^-6 N [inwards]*
Which type of magnetic pole is located in the Northern Hemisphere of the Earth? - Answers
South Magnetic Pole
What is a region of space where a ferromagnetic substance will have a magnetic force acting
on it called?
A) A Magnetic Pole
B) A Magnetic Domain
C) A Magnetic Flux
D) Magnetic Field - Answers D) Magnetic Field
What is the name of an electric device that converts kinetic energy into electric energy? -
Answers *Generator*
A motor uses electrical energy to create motion
What is the name of an electric device that converts electric energy into kinetic energy?
A) Motor
B) Generator - Answers A) Motor
True or False: According to Lenz's Law, the direction of the Emf induced is *always opposite*
the changing magnetic field. - Answers True
What is the angle between Earth's magnetic field and *horizontal* called?
A) Magnetic Inclination
B) Magnetic Declination - Answers A) Magnetic Incliniation
What is the angle between the direction a compass needle points and geographic *North* called?
A) Magnetic Inclination
B) Magnetic Declination - Answers B) Magnetic Declination
Magnetism is a ___________________________. - Answers Field Force
What is the name of a device that has two coils of wire that are linked by their mutual magnetic
fields? - Answers Transformer
, True or False: When drawing magnetic field lines around the North pole of a bar magnet, they
should be drawn *away* from the North pole. - Answers True
True or False: If magnetic field lines are drawn away from one end of a bar magnet, then this
end of the bar magnet must be a South magnetic pole. - Answers False
When drawing magnetic field lines, if the *lines are getting closer together,* what does this
indicate about the strength of the magnetic field in this region?
A) The strength of the field is increasing.
B) The strength of the field is decreasing. - Answers A) The *strength* of the field is
*increasing*
close= strong
far = weak
A wire carries an electric current in a direction that is perpendicular to a magnetic field. Four
possible orientations are shown in Figure 9.T.6. Which orientation creates a force on the wire
that is to the right? - Answers The only drawing that fits if the one where I= pointing straight
down, field force is indicated straight into page, According to RHR Option has to point right
indicated by letter D
A 15.0-cm diameter coil of wire is inside a 0.521-T magnetic field. What Emf is induced when it
remains stationary for 15.0 s? - Answers *No Emf is induced* in this wire since there is no
change to create the Emf since it remains stationary.
A charged object moves at 475 m/s to the South through a magnetic field of 1.42 T, which is
directed to the East. If the charge of the object is +12.5 nC, what is the magnitude and direction
of the magnetic force acting on the object? - Answers Given: v= 475m/s , B= 1.42, q= 1.42 where
magnetic field directed east and object moving south = 90deg
F= |q|VBsin(90)
F= q(V x B)
= Q V x B Sin Ө
= (12.5x10^-9) x (475) x (1.42) Sin(90)
F= 8.43125x10^-6
*F= 8.43 x10^-6 N [inwards]*
