128 Basic Engineering Mathematics
- The current i flowing in a capacitor at
time t is given byi= 12. 5 ( 1 −e−t/CR),
where resistance R is 30k and the
capacitance C is 20μF. Determine (a)
the current flowing after 0.5seconds and
(b) the time for the current to reach
10amperes.
10. The amountAafternyears of a sum invested
P is given by the compound interest law
A=Pern/^100 , when the per unit interest rate
ris added continuously. Determine, correct
to the nearest pound, the amount after 8 years
for a sum of £1500 invested if the interest
rate is 6% per annum.