question_answer

In L-R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula

A) \[I={{I}_{0}}{{e}^{-Rt/L}}\]                          

B) \[I={{I}_{0}}(1-{{e}^{-Rt/L}}\]

C) \[I={{I}_{0}}(1-{{e}^{Rt/L}})\]    

D) \[I={{I}_{0}}{{e}^{Rt/L}}\]

Correct Answer: B

Solution :

In L - R circuit when current increases we have \[I={{I}_{0}}(1-{{e}^{-Rt/L}})\]