a Calculate the resistance of the mercury 190 b Calculate th

(a) Calculate the resistance of the mercury.
1.90

(b) Calculate the fractional change in resistance during the heartbeat.
  _________ increase

Solution

a)
R = pl/A

= (9.58*10^-7*1)/(pi*(0.40*10^-3)^2)

= 1.90 Ohm

b)
dR/Ri = (100.043cm/100)^2-1
= 0.00086 Ohm increase