Answer
a)
$R=95.54\Omega$
(Other answers are possible.)
b)
$V=1.43V$
Thus, a voltage difference greater than 1.43 V is required to produce current through finger.
(Other answers are possible.)
Work Step by Step
(a) We know that
$R=\frac{\rho L}{A}$
We plug in the known values to obtain:
$R=\frac{0.15\times 0.05}{7.85\times 10^{-5}}$
$R=95.54\Omega$
(Other answers are possible.)
(b) According to Ohm's law
$V=IR$
We plug in the known values to obtain:
$V=15\times 10^{-3}\times 95.54$
$V=1.43V$
Thus, a voltage difference greater than 1.43 V is required to produce current through finger.
(Other answers are possible.)
