a physicist works in a laboratory where the magnetic field is `2T`. She wears a necklace enclosing of an area `100 cm^(2)` of field and having a resistance of `0.1 Omega`. Because of power failure, the field decays to `1 T` in millisecond. The electric charge circulated in the necklace assuming that the magnetic field is perpendicular to area covered by the necklace is

Options

A. 0.01 C
B. 0.001 C
C. 0.1 C
D. 1.0 C

Answer

C

Explanation

`q=(N(B_1-B_2)A)/R=(1(2-1)1-^(-2))/(0.1)=0.1C`