Download 1. What is the equivalent capacitance between points a and b? All

1. What is the equivalent capacitance between points a and b? All capacitors are 3.0
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Correct answer
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wo capacitors CI = 20-pF and C2 = 5-pF are connected in series and charged
with a 250-V power supply. What is the total energy stored in the two capacitors?
3. A proton is accelerated by a constant electric field of magnitude 360 NIC. Using
the equations of motion with constant acceleration find the proton's speed after
1.OO x
s, assuming it starts from rest.
Correct answer
4. A square loop with sides of length 50 cm is placed in a uniform electric field such
that the electric field makes an angle of 30" to the perpendicular direction of the
loop. If the electric field strength is 500 N/C what is the electric flux through the
loop?
2
C
Comment [AS4]: Correct answer
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5. A 50.0-pF capacitor is connected to a 500-V battery. Find the charge on .the
capacitor.
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6. A metallic conductor has a resistivity of 19 x
a.m. What is the resistance of
a piece of this conductor that is 30 m long and has a diameter of 4, ?m
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7. A "sandwich" is constructed of two flat pieces of metal (50.0 cm on a side) with a
1.00-mm-thick piece of a dielectric called Rutile ( K = 100) in between them.
What is the capacitance? (a = 8.85 x 10-12c2/N.m2).
a.
b.
c.
d.
177 pF
221 nF
8.85 p F
100pF
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[AS7]: Correct answer
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8. A charge of +2 C is at the origin. When charge Q is placed at 2 m along the
positive x axis, t h e F m ) a t 2 m along the negative x axis becomes zero.
What is the value of Q?
+2c
Q
F m e n t [AS8]: Correct answer
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9. 200, 0.75-W decorative lightbulbs are connected in parallel on a string of lights
which is connected to a 120-V source. What current is delivered to the lights by
the source?
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p m m e n t [AS9]: Correct answer
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10. An electron is sent at high speed toward a gold nucleus (charge +79e). What is
the electrical force acting on the electron when it is 3.0 x 10-l2 m away from the
gold nucleus? (e = 1.6 x lo-'' C, k, = 8.99 x 10' N.rn2/c2)
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comment [ASIO]:Correct answer /-
11. A 20-R platinum wire at 20°C with a temperature coefficient of resistivity of 4.6
x 10" ("c)-' will have what resistance at 150°C?
[comment [ASll]:Comct answer
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12. A flashlight bulb operating at a voltage of 1.5-V has a resistance of 12.0 R . How
many electrons pass through the bulb filament er secon (e = 1.6 x li)'19 C)?
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Comment [ASlZ]: Correct answer
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