The flux linked per each turn of coil of `5xx 10^3` turns changes from `0.4 xx 10^(-3)` Wb to `0.6 xx 10^(-3)` Wb in 0.2 sec. If the total resistance of circuit including the coil is 20 `Omega` , find the change induced charge in coil.

Options

A. 0.01 m c
B. 1.5 m c
C. 0.05 m c
D. 0.08 m c

Answer

C

Explanation

Here, `N=5xx10^3`
`phi_1=0.4xx10^(-3)` Wb
`phi_2=0.6xx10^(-3)` Wb
`R=20 Omega`
`rArr` Induced emf in coil
`Q=(N(phi_2-phi_1))/R`
`=(5xx10^3xx(0.6xx10^(-3)-0.4xx10^(-3)))/20`
`=(5xx10^(-3)xx2xx10^(-3))/20`
`therefore` Q=0.05 C