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Problem
Problem
A solenoid has an inductance of
10
H
10\,\text{H}
10
H
and a resistance of
2
M
Ω
2\,\text{M}\Omega
2
M
Ω
. It is connected to a
10
V
10\,\text{V}
10
V
battery. How long will it take for the magnetic energy to reach
1
/
4
1/4
1/4
of its maximum value? (JEE 1996)
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