Correct Answer - D
Induced emf `e=Bvl`
Induced current `i=(e)/(R)=(Bvl)/(R)`
Magnetic force `F=Bil=(B^(2)vl^(2))/(R)`
`1=((2)^(2)vxx(0.5)^(2))/(30)`
`1=30m//sec`
`e=Bvl=22xx30xx0.5=30V`
`i=e//R=30//30=1A`
`r=(30)/(2(1+0.5))xx0.5=5Omega`
`v_(b)-v_(a)=e-ir=30-1xx5=25V`
`V_(c)-V_(d)=ixx5=1xx5=5V` .