A metaillic circular loop of radius r is placed in unfirom magnetic field B acting perpendicular to the plane of the loop . A naughty boy pulls dimetrically oppsite corner so that after sometime, the loop changes into an ellipse of major and minor radius a and b . It total resistance of loop is R and it remains constant during the puilling . Find average change flowing through loop during pulling .

Options

A. `(B(piab))/(R)`
B. `(B(piab-pir^(2)))/(R)`
C. `(Bpir^(2))/(R)`
D. `(Bpirb)/(R)`

Answer

B