Physics 011
PQ#16
Chapter 16: Electric Charge and Electric Field
Practice Questions

Electrons carry a 


positive
charge. 


negative
charge. 


neutral
charge. 


variable
charge. 




The units of Coulomb's constants are 


Nm^{2}/C^{2} 


Nm 


Nm/C^{2} 


C^{2} 




The units of permittivity are 


unitless 


1/4*pi 


Nm^{2} 


C^{2}/Nm^{2} 




The unit of a charge is the 


N(ewton) 


m(eter) 


J(oule) 


C(oulomb) 




Which of the following are the units of electric field? 


N 


N*C 


N/C 


N/m^{2} 




Two charges Q_{1} and Q_{2} are separated by a distance D. If the distance is doubled, the force is 


increased
by a factor of 2. 


decreased
by a factor of 2. 


remains
the same. 


increased
by a factor of 4. 


decreased
by a factor of 4. 




Two charges Q_{1} and Q_{2} are separated by a distance D. If Q_{1} is doubled, the force is 


increased
by a factor of 2. 


decreased
by a factor of 2. 


remains
the same. 


increased
by a factor of 4. 


decreased
by a factor of 4. 




Two charges Q_{1} and Q_{2} are separated by a distance D. If Q_{1} and Q_{2} are doubled, the force is 


increased
by a factor of 2. 


decreased
by a factor of 2. 


remains
the same. 


increased
by a factor of 4. 


decreased
by a factor of 4. 




Two charges Q_{1} and Q_{2} are separated by a distance D. If both Q_{1} and D are doubled, the force is 


increased
by a factor of 2. 


decreased
by a factor of 2. 


remains
the same. 


increased
by a factor of 4. 


decreased
by a factor of 4. 




Two charges Q_{1} and Q_{2} are separated by a distance D. If Q_{1}, Q_{2} and D are all doubled, the force is 


increased
by a factor of 2. 


decreased
by a factor of 2. 


remains
the same. 


increased
by a factor of 4. 


decreased
by a factor of 4. 







A 


B 


C 


D 


E 







A 


B 


C 


D 


E 







A 


B 


C 


D 


E 







A 


B 


C 


D 


E 


Not
shown. 







A 


B 


C 


D 


E 


Nowhere
shown. 







4 


10 


16 


20 


25 







zero 


7.1x10^{5} 


1.0x10^{6} 


1.4x10^{6} 


2.0x10^{6} 







Vertical
and up. 


Horizontal
and to the right. 


Vertical
and down. 


Horizontal
and to the left. 







Vertical
and up. 


Horizontal
and to the right. 


Vertical
and down. 


Horizontal
and to the left. 







negative 


zero 


positive 







The
electric field at e is less than that at a and c. 


The
electric field at c is greater than that at a and e. 


The
electric field at c is less than that at a and e. 


The
electric field at e is greater than that at a. 




In question 20 what would be the charge on the exterior surface (d)? 


negative 


zero 


positive 




Four people tell you they have a negative charge of a certain value. Which one is not telling the truth? 


Mine
is 1.90x10^{18} Coulomb. 


Mine
is 1.6x10^{18} Coulomb. 


Mine
is 1.92x10^{18} Coulomb. 


Mine
is 2.4x10^{16} Coulomb. 




What must be the charge on each of two 100 kg spherical masses in order for the electrical force to equal the gravitational force? 


8.6x10^{19}
C 


8.6
nanoC 


7.4x10^{17}
C 


100
C 




How many electrons would it take to make up a charge of minus one millionth of a Coulomb? 


100000 


10000000 


8x10^{42} 


6.25x10^{12} 