MIDTERM 1 UTC 4.132 Thu-Sep 27 , 7:00PM - 9:00PM. Bring pencils, calculators (memory cleared). Course Summary Unit 1 Provided. Question 1. Which one of these statements is true ? When near the center of the object, the electric field hardly changes with increasing distance from.
Bring pencils, calculators (memory cleared)
Course Summary Unit 1 Provided
Which one of these statements is true?
When near the center of the object, the electric field hardly changes with increasing distance from
a uniformly charged long rod.
a uniformly charged ring.
a uniformly charged disk.
a point charge.
A solid metal ball carrying negative excess charge is placed near a uniformly charged plastic ball.
Which one of the following statements is true?
The electric field inside both balls is zero.
The electric field inside the metal ball is zero, but it is nonzero inside the plastic ball.
The electric fields inside both objects are nonzero and are pointing toward each other.
The electric field inside the plastic ball is zero, but it is nonzero inside the metal ball.
1) Vector Arithmetic
Find = <observation loc.> - <source loc.>
2) Electric Force and Field of a Charged Particle
from – to +
Electric field of a dipole
Forces on a dipole
Electric field due to something else.
Calculate force on each Charge
4) Induced Dipoles
Know and gives
Example: Force between charge and induced dipole
4) Polarization of Metals and Insulators
What is E inside metal in static equilibrium?
6) Flux and Gauss’ Law
Examples: Spherical Shell, Long Rod, Large Sheet
6) Gauss’s Law and Metals
Use E=0 inside metals
Examples: Neutral Metal Solid with Void; Charge in Void
Example: Large Sheet and Infinite Rod