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  4. For given L-R circuit, growth of current as function of time t is shown in graph. Which of the following option represents value of time constant most closely for the circuit?

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Q. For given L-R circuit, growth of current as function of time t is shown in graph. Which of the following option represents value of time constant most closely for the circuit?Physics Question Image

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Solution:

In one time constant 63% change occurs in the value of current .The 63% of maximum current is 1.26 A .It is obvious from graph that current 1.26A corresponds to time which is slightly greater than 0.9sec. Hence option having 1s is most appropriate.