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Unformatted text preview: Sphere B has a charge of –2.40 µC. Spheres A and B are
brought into momentary contact and separated to a distance of 2.50 cm. 5. After contact, the charge on sphere A is
D. 1.05 µC
6.90 µC Use your recorded answer for Multiple Choice 5 to answer Numerical Response 3.*
3. The magnitude of the electric force exerted by sphere A on sphere B after contact
and separation is __________ N. (Record your three-digit answer in the numerical-response section on the answer sheet.)
*You can receive marks for this question even if the previous question was answered incorrectly. 3 6. The intensity and direction of the electric field produced by an alpha particle at a
distance of 5.0 × 10–11 m from the particle is
B. 5.8 × 1011 N/C, away from the alpha particle C. 1.2 × 1012 N/C, toward the alpha particle D. 7. 5.8 × 1011 N/C, toward the alpha particle 1.2 × 1012 N/C, away from the alpha particle The magnitude of an electric field at a distance x from a point charge Q is
8.3 × 10–4 N/C. If the distance is increased to 3x and the charge is reduced
, then the magnitude of the electric field will be
4 A. 1.9 × 10–3 N/C B. 3.7 × 10–4 N/C C. 6.9 × 10–5 N/C D. 2.3 × 10–5 N/C 4 Use the following information to answer the next question.
Cable TV sends its signals on a coaxial cable that has a central copper wire.
This central wire is surrounded by a layer of plastic that is then surrounded by
a conducting cylinder of fine wire mesh. The outer layer of the cable is a
Plastic layer Outer 8. Wire layer mesh Copper The wire mesh layer is necessary because the
D. cable needs a rigid reinforcing layer
electric force inside a conductor is not zero
electrical signals need to be shielded from strong magnetic and electric fields
electrical signals will travel better if they have two different transmitting wires 5 Use the following diagram to answer the next three questions.
+ + ++ + + + +
+ + + ++
– – ––
– – – – – –– – – – –
–– Thundercloud Lightning bolt 9. The bottom of a thundercloud usually becomes negatively charged. Before
lightning strikes, the charge of the ground directly beneath the thundercloud will
D. 10. positive by induction
negative by induction
positive by conduction
negative by conduction During the downward lightning strike, the charge on the top of the tree becomes
D. negative by induction
negative by conduction
neutral by induction
neutral by conduction 6 Numerical Response
4. A certain lightning bolt produces a temperature of 3.00 × 104 °C, a current of
8.00 × 104 A, and a voltage of 1.50 × 108 V. If the bolt lasts 1.20 × 10–5 s while
striking a tree, the quantity of charge transferred to the tree, expressed in scientific
notation, is b × 10–w C. The value of b is __________.
(Record your three-digit answer in the numerical-response section on the answer sheet.) Use the following information to answer the next question.
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This note was uploaded on 01/14/2014 for the course PHYSICS Physics 30 taught by Professor Quinlan during the Fall '09 term at Centennial High School.
- Fall '09