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A coil inductance 8.44 mH and resistance 6 O is connected to a. 12 V battery. The current in the coil is 1.0 A at approximately the time(a) 500 s(b) 25 s(c) 35 ms(d) 1 ms
(d) KEY CONCEPT : Using I = I0 But I0 = V/R and t = L/R ? I = V/R (1 – e-Rt/L) = 12/6 [ 1 – e-6t/8.4x 10-3] 1 (given) ? t = 0.97 x 10-3 ˜ 1 ms (D) 1. (a,b,c) 1/RC, R/L and 1/ vLC have the dimensions of frequency
(d) KEY CONCEPT : Using I = I0
But I0 = V/R and t = L/R
? I = V/R (1 – e-Rt/L) = 12/6 [ 1 – e-6t/8.4x 10-3]
1 (given)
? t = 0.97 x 10-3 ˜ 1 ms
(D)
1. (a,b,c)
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