You wish to build a time delay circuit using a 75h inductor. you want the voltage across the inductor to fall to 3.0v from an initial voltage of 12v in a period of 2.0s. what resistance must be used in the circuit? select one of the following: (a) 0.019ω (b) 110ω (c) 150ω (d) 52ω (e) 11ω

option D

Explanation:

given,

inductance = L = 75 H

initial voltage (V₀) = 12 V

voltage across the inductor to fall to =  3.0 V

time taken to fall of voltage = 2.0 s

Resistance of the circuit = ?

using equation

taking ln both side

R = 51.97 Ω

hence, the correct answer is option D

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