lOMoARcPSD|48872601
April 2021 - PHYSICS 3 Final Exam Questions and Solutions
physics 12 (Quang Trung Secondary School)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by Nhat Nam (nguyennhatnam1307@gmail.com)
lOMoARcPSD|48872601
VIETNAM NATIONAL UNIVERSITY
THE INTERNATIONALUNIVERSITY
MID-TERM EXAMINATION- CLASS
(IU)-
- HCMC
Student ID:
Student Name:
Date: 05 April 2021
Duration: 90 minutes
SUBJECT: PHYSICS 3
Chair of Department of Physics:
Lecturer: Phan Hiên V0, Pham Trung
Signature:
Signature:
Kiên
Full name: Phan Bào Ngoc
Use of ceil phones, laptops,
INSTRUCTIONS: This is a closed book examination.
not allowed.
1/(20 pts) Three charged particles (q1
=
q3
=
+5 C, and q2
2 are placed at separation of 50 cm. Determine the
=
distance
dictionaries is
and
-15 HC) form a straight line. Particles
I and 3 so that the net
between
I
particles
electrostatic force on particle 3 from particles 1 and 2 is zero.
(k 8.99x10' N.mC)
x=0
2/ (20
pts) Fig.
1 shows a thin rod with a non-uniform linear
charge density of A
point P if D
=L/4
=
0.2x HC/m. Evaluate the electric potential at
=
25 cm. Assume that the potential is zero at
Roxl
-D
Fig. 1
infinity.
Hint: a dtx=(x - dln(x + d))|
3/ (20 pts)
In Fig. 2, V =9.0 V, C1
=
C2=30 uF, and C3
=
C4= 15 F.
What is the charge on capacitor 4?
circuit in
4/ (20 pts) Determine the current through each resistor in the
Fig. 3:
e
12 V, a=6 V,
R
=
L
Fig. 2
62, R2 =42, and R3= 12 Q.
5/ (20 pts) Two charged concentric spherical shells have radii 10.0 cm
on the inner shell is 4x10* C, and that on the
and 15.0 cm. The
charge
outer shell is 2x10 C. Find the electric field at:
R
R
Tt8
(a) r= 12.0 cm
(b) r= 20.0 cm
Fig. 3
END OF QUESTION PAPER
Downloaded by Nhat Nam (nguyennhatnam1307@gmail.com)