clear
//
//given and derived
rm=75
im=300*(10**-6)
//case a
i=5
rsh=(rm*im)/(i-im)
printf("\n rsh= %e  ohm",rsh)
//case b
i=7.5
rsh=(rm*im)/(i-im)
printf("\n rsh= %e  ohm",rsh)
//case c
i=10
rsh=(rm*im)/(i-im)
printf("\n rsh= %e  ohm",rsh)