Question

Find the value of capacitor, if the rate of change of voltage across the capacitor is 0.78V/µs and current= 12µA.

(a) 5µF

(b) 2µF

(c) 10µF

(d) 15µF

I had been asked this question in a dream while sleeping

The doubt is from Slew Rate in chapter Practical Limitations of Op Amp Circuits of Linear Integrated Circuits

Answer 1

The accurate answer is (d) 15µF

Let me simplify it: Rate at which the voltage across the capacitor increases is given as dVc/dt= I/C

=> C= I/ (dVc/ dt)  = 12µA/0.78V/µs = 15.38 ≅15µF.