Waves Practice Problem Set Worksheet Page 43
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ECHANICS
RACTICE
ROBLEM
ETS
10.3
E
R
LECTRICITY
EVIEW
1. Two charges are separated by 3.0 cm. Object A has a charge of + 6.0µC while
object B has a charge of +3.0µC. What is the force on object A?
Answer: 180 N away from B
2. A sphere with charge + 6.0µC is located near two other charged spheres. A -
3.0µC sphere is located 40.0cm to the right and a + 1.5µC sphere is located 30.0
cm directly underneath. Determine the net force (magnitude and direction) on the
+ 6.0µC charge.
Answer: 1.35 N at 42°
-8
3. A negative charge of 2.0 x 10
C experiences a force of 0.060 N to the right in an
electric field. What is the field magnitude and direction?
6
Answer: 3 x 10
N/C, to the left
4. What is the magnitude and direction of the electric field at a point midway
between a - 8.0µC and a + 6.0µC that are 4.0 cm apart.
8
Answer: 3.15 x 10
N/C toward negative
-16
5. An electron acquires 3.45 x 10
J of kinetic energy when it is accelerated by an
electric field in a computer monitor from plate A to plate B. What is the potential
difference between the plates and which plate has a higher potential?
3
Answer: 2.15 x 10
V; Plate B is higher
6. Two parallel plates are connected to a 100-V power supply and are separated by
an air gap. How small can the gap be if the air is not to exceed its breakdown
6
-5
value of E = 3 x 10
V/m?
Answer: 3.3 x 10
m
7. An automobile headlight with a resistance of 30 Ω is placed across a 12-V
battery. What is the current through the circuit?
Answer: 0.40 A
8. A bird stands on an electric transmission line carrying 2500 A. The resistance per
-5
meter of the line is 2.5 x 10
Ω/m. If the bird’s feet are 4.0 cm apart, what voltage
does the bird feel?
Answer: 0.0025 V
9. What is the diameter of a 1.00-m length of tungsten wire whose resistance is 0.22
-8
-4
Ω? The resistivity of tungsten is 5.6 x 10
Ω •m.
Answer: 5.7 x 10
m
10. Suppose the resistance in a copper wire with a diameter of 1.02 mm carrying 1.67
A has a resistance of 1.05 Ω at 20°C. What is the resistance at 0°C and 100°C if
-1
the temperature coefficient for copper is 0.00393°C
? Answer: 0.97 Ω; 1.38 Ω
11. What is the maximum voltage that can be applied to a 2.7-kΩ resistor rated at
0.25 Watts?
Answer: 26 V
Gamzon & Gregorian-Michaelsen
6/7/16
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