A coil of inductance 10 H and internal resistance 40 Ω is connected as shown in the figure. After, it is moved to point 2 at t = 0. If, at t = 0+, the voltage across the coil is 120 V, the value of resistance R is _______.
1
20 Ω
2
40 Ω
3
60 Ω
4
0 Ω