Question

What is Helmholtz equation?

(a) i=I(e^Rt/L)

(b) i=I(1-e^-Rt/L)

(c) i=I(1+e^-Rt/L)

(d) i=I(e^-Rt/L)

I got this question in class test.

This intriguing question comes from Analysis of Growth & Decay topic in chapter Inductance in a DC Circuit of Basic Electrical Engineering

Answer 1

The correct answer is (b) i=I(1-e^-Rt/L)

For explanation: Helmholtz equation is an equation which gives the formula for the growth in an inductive circuit. Hence the Helmholtz formula is: i=I(1-e^-Rt/L).