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BellWork

BW. Draw the distribution of charges of an electroscope when it is charged by bringing a glass rod that was rubbed against silk near its probe. BellWork.

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BellWork

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  1. BW • Draw the distribution of charges of an electroscope when it is charged by bringing a glass rod that was rubbed against silk near its probe.

  2. BellWork • If two charges of +1.6x10-19 C are separated by a distance of 2 meters, what is the electrostatic force between them? Is it attractive or repulsive? +1.6x10-19 C +1.6x10-19C 2 meters

  3. BW • What charge does the dome of a van de Graff generator have?

  4. Electric Fields • Electric Field – the region around a charged particle through which a force is exerted on another object.

  5. Electric field lines • Imaginary line along which a positive test charge would move In other words, the direction of an electric field is direction of the force on a stationary positive charge located any point on the field line (tangent to the line for a curved field line) Positively Charged Sphere +Q

  6. Negatively charged sphere -Q

  7. Between Opposite Charges - + -electric field lines go from positive to negative charges and never intersect

  8. Between Positive Charges + +

  9. Between Negative Charges - -

  10. + Fnet + + Fnet Fnet Between Opposite Charged Plates + + + + + + + + + + + + + + Uniform Field net force same - - - - - - - - - - - - - -

  11. The Field + + + + + + + + + + + + + + - - - - - - - - - - - - - -

  12. Identify the following particles, given the electric fields:

  13. Draw the electric field lines between these particles: 1. + + 3. + 2. + -

  14. BW • Draw the electric field lines between these charged particles: + +

  15. The force on a test charge per unit charge E = electric field strength (N/C) Fe = electrostatic force (N) q = electric charge (C) Electric Field Strength • The electric field strength is directly proportional to the electrostatic force. • If E increases, then Fe increases. If E decreases, then Fe decreases. How does this relate to distance?

  16. Example • What is the magnitude of the electric field strength at a point in a field where an electron experiences a 1.0 N force?

  17. If a proton is found in an electric field with a strength of 10 N/C, what is the electrostatic force that the proton experiences?

  18. What are the magnitude and direction of the electric field 1.5 m away from a positive charge of 2.1*10-9 C?

  19. From the diagram of A and B above, rA is 0.0005 m and rB is 0.0003 m. What is the force acting on q at A and B, if the charge of q is 1.2 * 10-11 C and the charge of Q is 1.5 * 10-11 C? For situation A and B above, calculate the electric field for the charge Q passing into charge q’s electric field.

  20. CONDUCTING SPHERE • On the surface, charge is distributed uniformly (evenly). • Electric field lines are normal (perpendicular) to the surface. • Electric field strength varies with the square of the distance, just as a point charge. Hollow Sphere The electric field stength inside a hollow, charged conducting sphere is zero

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