In `L-R` circuit `l=l_(0)[1-e^(-t//lamda)]`
Here `l=` electric current in the circuit. Then

Options

A. the dimensions of `l_(0)` and `lamda`
B. the dimension of `t` and `lamda` are same
C. the dimensions o `l` and `l_(0)` are not same
D. All of the above

Explanation

(b) Exponent has no dimensions
`:. [e^(-t//lamda)]=[M^(0)L^(0)T^(0)]` ltbr or `[-t/(lamda)]=[M^(0)L^(0)T^(0)]` or `[t]=[lamda] :. [lamda]=[T]`
Hence (b) is correct