The voltage drop across the diodes in the 4 way

The voltage drop across the diodes in the 4-way bridge is 0.7 V per diode.
The 4 V zener diode is initially isolated from the circuit by Switch A.
Figure 3
Question 7
Which of the following is closet to V
MAX
at terminal X?
2 V
20 Hz
load
1 : 2
10
X
A
A. 4 V
B. 2.6 V
C. 5.6 V
D. 4.2 V
µF
Question 8
Which of the following adjustments would decrease the size of the ripple voltage across
the load?
Question 9
Which of the following best explains why the zener diode will unlikely act to smooth the
voltage to a constant 4 V?
SECTION B – Detailed Study 3 – continued

2012 PHYSICS EXAM 1
Figure 4 shows a charging and discharging circuit for a 200  F capacitor.
The capacitor is initially discharged and the switch is in position B.
The switch is then moved from position B to A, as shown in Figure 4.
Figure 4
Question 10
Which of the following best approximates the time taken for the voltage across the 10 k 
resistor to reach 9 V?
24 V
200 µF
10 k Ω
5 k Ω
A B
 TSSM 2012 Page 33 of 37
SECTION B – Detailed Study 3 – continued
TURN OVER
Question 11
After an initial change, which of the following best approximates the time taken for the
voltage across the 5 k  resistor to return to 0 V?
A. 1 sec
B. 2 sec
C. 5 sec
D. 10 sec

2012 PHYSICS EXAM 1
 TSSM 2012 Page 34 of 37
Question 12
Which of the following plots (A-D) best matches the voltage vs. time curve across the 5 k
during the discharging process?

END OF QUESTION AND ANSWER BOOK
4
8
12
16
20
24
28
32
1 2 3 4 5 6
Time (s)
Voltage (V)
A
B
C
D

2012 PHYSICS EXAM 1
 TSSM 2012 Page 35 of 37
Data Sheet
1 Velocity, acceleration
2 Equations for constant acceleration
3 Newton’s second law
4 Circular motion
5 Hooke’s law
6 Elastic potential energy
7
Gravitational potential energy near the surface
of the earth
8 Kinetic energy
9 Newton’s law of universal gravitation
10 Gravitational field
11 Stress
12 Strain
13 Young’s modulus
14 Transformer action
15 AC voltage and current
,
16 Voltage, power
,
17 Resistors in series
18 Resistors in parallel
t
x
v



t
v
a



at u v  
2
2
1
at ut x  
as u v 2
2 2
 
 
t v u x  
2
1
ma F 
2
2 2 4
T
r
r
v
a

 
kx F  
2
2
1
kx
mgh
2
2
1
mv
2
2 1
r
M GM
F 
2 r
GM
g 
A
F
 
L
L 
 
strain
stress
E 
2
1
2
1
N
N
V
V

p p RMS
V V


2 2
1
p p RMS
I I


2 2
1
IR V  VI P 
2 1
R R R
T
 
2 1
1 1 1
R R R
T
 

2012 PHYSICS EXAM 1
 TSSM 2012 Page 36 of 37
19 Capacitors
Time constant:
20 Lorentz factor
21 Time dilation
22 Length contraction
23 Relativistic mass
24 Universal gravitational constant G = 6.67 x 10
-11
N m
2
kg
-2
25 Mass of Earth M
E
= 5.98 x 10
24
kg
26 Radius of Earth R
E
= 6.37 x 10
6
m
27 Mass of the electron m
e
= 9.1 x 10
-31
kg
28