If a coil of 40 turns and area 4.0 `cm^(2)` is suddenly removed from a magnetic field, it is observed that a charge of `2.0 xx 10^(-4)C` flows into the coil. If the resistance of the coil is `80 Omega,` the magnetic flux density in Wb/m2 is …..

Options

A. `0.5`
B. `1.0`
C. `1,5`
D. `2.0`

Answer

B

Explanation

`q = (N)/(R) phi = ( N )/(R) (BA)`
`B = ( q R)/( NA) = ( 2 xx 10 ^(-4))/( 40 xx 4 xx 10 ^(-4)) = 1 Wb// m ^(2)`