A hundred turns of insulated copper wire are wrapped around an iron cylinder of area `1xx10^(-3) m^(2)` and are connected to a resistor. The total resistance in the circuit is `10` ohms. If the longitudinal magnetic induction in the iron changes from `1` weber `m^(-2)`, in one direction to `1` weber `m^(-2)` in the opposite direction, how much charge flows through the circuit

Options

A. `2xx10^(-2)C`
B. `2xx10^(-3)C`
C. `2xx10^(-4)C`
D. `2xx10^(-5)C`

Answer

A

Explanation

`dQ=(dvarphi)/(R )=(nAdB)/(R )=(100xx1xx10^(-3)xx2)/(10)=2xx10^(-2)C`