10. Which of the following is an electrical insulator? A. a penny
B. a bike chain
C. a tree
D. a gold tooth

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

The material that keeps its new shape after it is stretched is called?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?