Phys 202- Exam 1 actual questions and
CORRECT answers
Two charged balls are repelling each other as they hang from the ceiling. What can you say
about their charges? - CORRECT ANSWER both are positive or both are negative
When you rub a plastic rod with fur, the plastic rod becomes negatively charged and the fur
becomes positively charged. As a consequence of rubbing the rod with the fur, - CORRECT
ANSWER the rod gains mass and the fur loses mass
when 1.0 uC point charge is 18m from a second point charge, the force each one experiences
is of 1.0 uN. what is the magnitude of the second charge? - CORRECT ANSWER 36
nC
if we increase charge 1 to 5Q, what is the magnitude of F1 (3N)? (F1 and F2 repel each other)
- CORRECT ANSWER 15N
Two balls with charges +Q and +4Q are
fixed at a separation distance of 7R. Is it
possible to place another charged ball Q0
on the line between the two charges such
that the net force on Q0 will be zero? - CORRECT ANSWER yes, independent of the
sign or value of Q0
an asteroid of mass 58,000kg carrying a charge of 15 uC is 180m from a second asteroid of
mass 52,000 kg carrying a charge of 11uC. What is the magnitude of the net force the
asteroids exert upon each other, assuming we can treat them as point particles. - CORRECT
ANSWER 0.000040 N
two equally charged tiny spheres of mass 1.0 g are placed 2.0cm apart. when released, they
begin to accelerate away from each other at 414 m/s^2. what is the magnitude of the charge
on each sphere, assuming only that the electric force is present? - CORRECT
ANSWER 140 nC
, if all the dimensions of a Gaussian surface were to double, but the charge +q remains at its
center, the electric flux through the surface will - CORRECT ANSWER remain the
same
a proton and an electron are in a constant electric field created by oppositely charged plates.
you release the proton from the positive side and the electron from the negative side. which
feels the larger electric force? - CORRECT ANSWER they feel the same magnitude of
force but in opposite directions
a proton and an electron are in a constant electric field created by oppositely charged plates.
you release the proton from the positive side and the electron from the negative side. which
has the larger acceleration? - CORRECT ANSWER electron
how much work must we do on an electron to move it from point A, which is at a potential of
+50V, to point B, which is at a potential of -50 along the semicircular path. - CORRECT
ANSWER 1.60 x 10^-17 J
how much work is needed to carry an electron from the positive terminal to the negative
terminal of a 9.0V battery? - CORRECT ANSWER 14.4 x 10^-19 J
Four point charges are
arranged at the corners
of a square. Find the
electric field E and the
potential V at the center
of the square - CORRECT ANSWER E ≠ 0, V = 0
Capacitor C1 is connected across a
battery of 5 V. An identical capacitor C2
is connected across a battery of 10 V. Which one has more charge - CORRECT
ANSWER C2
CORRECT answers
Two charged balls are repelling each other as they hang from the ceiling. What can you say
about their charges? - CORRECT ANSWER both are positive or both are negative
When you rub a plastic rod with fur, the plastic rod becomes negatively charged and the fur
becomes positively charged. As a consequence of rubbing the rod with the fur, - CORRECT
ANSWER the rod gains mass and the fur loses mass
when 1.0 uC point charge is 18m from a second point charge, the force each one experiences
is of 1.0 uN. what is the magnitude of the second charge? - CORRECT ANSWER 36
nC
if we increase charge 1 to 5Q, what is the magnitude of F1 (3N)? (F1 and F2 repel each other)
- CORRECT ANSWER 15N
Two balls with charges +Q and +4Q are
fixed at a separation distance of 7R. Is it
possible to place another charged ball Q0
on the line between the two charges such
that the net force on Q0 will be zero? - CORRECT ANSWER yes, independent of the
sign or value of Q0
an asteroid of mass 58,000kg carrying a charge of 15 uC is 180m from a second asteroid of
mass 52,000 kg carrying a charge of 11uC. What is the magnitude of the net force the
asteroids exert upon each other, assuming we can treat them as point particles. - CORRECT
ANSWER 0.000040 N
two equally charged tiny spheres of mass 1.0 g are placed 2.0cm apart. when released, they
begin to accelerate away from each other at 414 m/s^2. what is the magnitude of the charge
on each sphere, assuming only that the electric force is present? - CORRECT
ANSWER 140 nC
, if all the dimensions of a Gaussian surface were to double, but the charge +q remains at its
center, the electric flux through the surface will - CORRECT ANSWER remain the
same
a proton and an electron are in a constant electric field created by oppositely charged plates.
you release the proton from the positive side and the electron from the negative side. which
feels the larger electric force? - CORRECT ANSWER they feel the same magnitude of
force but in opposite directions
a proton and an electron are in a constant electric field created by oppositely charged plates.
you release the proton from the positive side and the electron from the negative side. which
has the larger acceleration? - CORRECT ANSWER electron
how much work must we do on an electron to move it from point A, which is at a potential of
+50V, to point B, which is at a potential of -50 along the semicircular path. - CORRECT
ANSWER 1.60 x 10^-17 J
how much work is needed to carry an electron from the positive terminal to the negative
terminal of a 9.0V battery? - CORRECT ANSWER 14.4 x 10^-19 J
Four point charges are
arranged at the corners
of a square. Find the
electric field E and the
potential V at the center
of the square - CORRECT ANSWER E ≠ 0, V = 0
Capacitor C1 is connected across a
battery of 5 V. An identical capacitor C2
is connected across a battery of 10 V. Which one has more charge - CORRECT
ANSWER C2
