4. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Suppose you wish to fabricate a uniform wire from 1.50 g of copper. The wire is to have a resistance of R = 0.300 0 and all the copper is to be used. (a) What must be the length of this wire? m (b) What must be the diameter of this wire? um Need Help? Master It Submit Answer 5. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm varies with time according to the equation q = 5t + 3t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 1.10 s? (b) What is the value of the current density? KA/m2 Need Help? Watch It3. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The resistors in the circuit below have the following values: R, = 7.00 2, R2 = 7.00 0, and R3 = 4.30 0. The two batteries each have a voltage of 6.00 V. R2 R1 R3 (a) Find the current in through R3. A (b) How much power do the batteries deliver to R3? W Additional Materials Reading2. [-/3 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. Take & = 10.0 V, R, = 52.0 kn, R2 = 175 kn, and C = 12.5 UF. R MM R2 (a) Determine the time constant before the switch is closed. S (b) Determine the time constant after the switch is closed. S (c) Let the switch be closed at t = 0. Determine the current in the switch as a function of time. (Assume I is in A and t is in s. Do not enter units in your expression. Use the following as necessary: t.) I = Need Help? Watch It1. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the circuit shown in the figure below, where R, = 6.00 0, R2 = 7.00 0, and & = 12.0 V. 10.0 0 WW R2 5.00 0 2.00 0 R (a) Find the voltage (in V) across R1. V (b) Find the current (in A) in R1. A