A coil having n turns and resistance `R Omega` is connected with a galvanometer of resistance `4R Omega`. This combination is moved in time t seconds from a magnetic field `W_(1)` weber to `W_(2)` weber. The induced current in the circuit is

Options

A. `-(W_(2)-W_(1))/(5 Rnt)`
B. `-(n(W_(2)-W_(1)))/(5 R t)`
C. `-(W_(2)-W_(1))/(R n t)`
D. `-(n(W_(2)-W)_(1))/(R t)`

Answer

B

Explanation

`I = (n d phi)/(R' d t) = -(n (W_(2)-W_(1)))/(5RT)`