If a brass wire is 4 cm long with a diameter of 1.3 cm, can you use the set-up in this lab to measure its resistance? (Hint: consider the limitation of sensitivity for measuring voltage.) ( No. The voltage over the wire is 0.022 mV at 1.0 A and only 0.044 mV even at 2.0 A!)

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples