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Problem
Problem
When a choke coil carrying a steady current is short-circuited, the current in it decreases to
β
(
<
1
)
\beta (< 1)
β
(
<
1
)
times its initial value in a time
T
T
T
. The time constant of the choke coil is (a)
T
β
\frac{T}{\beta}
β
T
(b)
T
ln
(
1
β
)
\frac{T}{\ln\left(\frac{1}{\beta}\right)}
l
n
(
β
1
)
T
(c)
T
ln
β
\frac{T}{\ln \beta}
l
n
β
T
(d)
T
ln
β
T \ln \beta
T
ln
β
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