Physics Question on Magnetic Field

Question

As per the given figure, if $\frac{ dI }{ dt }=-1 A /$ s then the value of $V _{ AB }$ at this instant will be ______ $V$

As per the given figure, if dI /dt }=-1 A / s then the value of V { AB } at this instant will be

Accepted Answer

The correct answer is 30.
As per the given figure, if dI /dt }=-1 A / s then the value of V { AB } at this instant will be

dtdI=−1secA
VA−IR−LdtdI−12=VB
VA−2×12−6(−1)−12=VB
VA−VB=36−6=30 volt