question_answer

The circuit shown has been operating for a long time. The instant after the switch in the circuit labeled S is opened, what is the voltage across the inductor \[{{V}_{L}}\] and which labeled point (A or B) of the inductor is at a higher potential? Take \[{{R}_{1}}=4.0\,\Omega \], \[{{R}_{2}}=8.0\,\Omega \] and \[L=2.5\,H\].

A) \[{{V}_{L}}=12V\], point A is at the higher potential

B) \[{{V}_{L}}=12V\], point B is at the higher potential

C) \[{{V}_{L}}=6V\], point A is at the higher potential

D) \[{{V}_{L}}=6V\], point B is at the higher potential