1.A copper wire has a diameter of 1.660 mm. What magnitude current flows when th

Question

1.A copper wire has a diameter of 1.660 mm. What magnitude current flows when the drift velocity is 1.00 mm/s?

Figure 19.33

2.) The defibrillator shown in Figure 19.33 passes 14.0 A of current through the torso of a person for 0.0600 s. How much charge moves?
______________ C

(b) How many electrons pass through the wires connected to the patient?
___________ electron

1.A copper wire has a diameter of 1.660 mm. What magnitude current flows when the drift velocity is 1.00 mm/s? . at 20.0½C, how long should it be?_______________ m Figure 19.33 2.) The defibrillator shown in Figure 19.33 passes 14.0 A of current through the torso of a person for 0.0600 s. How much charge moves? ______________ C (b) How many electrons pass through the wires connected to the patient? ___________ electron 3.If the 0.150 mm diameter tungsten filament in a light bulb is to have a resistance of 0.250

Explanation / Answer

v = i/neA

i = vneA = 1e-3*8.49e28*1.6e-19*3.14*0.83e-3*0.83e-3 = 29.38 A <---------answer

2) q = i*t = 14*0.06 = 0.84 <---------answer

b) q = ne

n = q/e = 0.84/1.6e-19 = 5.25e+18 <---------answer

3)

R = rho*L/A

L = R*A/rho

A = area = pi*r^2

r = D/2 = 0.150/2 = 0.075 mm = .075e-3 m

L = (0.25*3.14*0.075e-3*0.075e-3)/(5.6e-8)

L = 0.0788 m = 7.88 cm

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