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Q> A solenoid has an inductance of 10 henry and a resistance of 2 Ω. It is connected to a 10 volt battery.How long it will take for the magnetic energy to reach 1/4 of its maximum value ?

Q> A solenoid has an inductance of 10 henry and a resistance of  2 Ω. It is connected to a 10 volt battery.How long it will take for the magnetic energy to reach 1/4 of its maximum value ?

Grade:12

2 Answers

Saurabh Kumar
askIITians Faculty 2411 Points
6 years ago
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Since, time required for, i = i0 / 4.
Put the value and find the answer for time...

Good Luck.....................
divyanshu
13 Points
2 years ago
we know that e=1/2lio^2 in the question it is given that maximum energy is 1/4 then  what we know  can put that in formula that we can get energy 1/4 we can put the value of io as 1/2 square then energy became 1/4 and simple use the formul of io/2=io(1-e-rt/l)..answer comes out to be a 3.45 which is equal to 3.5 approx..

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