Capacitors - Engineering

Q1:

A 0.47 F capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is

A 170 

B 17 

C 0.000169 

D 1.7 

ANS:A - 170 

What if it comes to the exam?

How to solve it without a calculator?

Is there any easy trick to solve the reciprocal problem?