A coil of inductance 10 H, resistance 40 Ω is connected as shown in the figure. The switch S connected with point 1 for a very long time, is moved to point 2 at t=0. If, at t=0^+, the voltage across the coil is 120 V, the value of the resistance R is __________
(a) Zero
(b) 20 Ω
(c) 40 Ω
(d) 60 Ω
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