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Q.

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In the given circuit the resistance R can be varied. Battery having emf 18 volt is having internal resistance 3Ω. The value of  R is selected such that power dissipated in it is maximum. Now  6Ω resistance is replaced by an inductor having inductance  L=6 mH so circuit will appear like the circuit shown in diagram given below

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Find time constant for above circuit in milliseconds.

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a

3

b

4

c

5

d

None of these

answer is A.

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Detailed Solution

R=2Ω  (Maximum Power transfer)
Req across inductor  65Ω
τ=LReq=5 m/s

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