The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is

Question

The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is (A) 20 Hz (B) 50 Hz (C) 200 Hz (D) 500 Hz

Tardigrade Admin · Accepted Answer

Energy will be maximum, when current is maximum. Energy will be minimum, when current is minimum.

\Rightarrow \frac{T}{4} = 5 \times 1 0^{- 3} s; T = 20 \times 1 0^{- 3} s

v = \frac{1}{T} = \frac{1}{( 20 \times 1 0 ^{- 3} s )} = 50 Hz .

Q. The magnetic field energy in an inductor changes from maximum value to minimum value in $5.0 m s$ when connected to an $A C$ source. The frequency of the source is

$20 Hz$

$50 Hz$

$200 Hz$

$500 Hz$

Energy will be maximum, when current is maximum. Energy will be minimum, when current is minimum.
$\Rightarrow \frac{T}{4} = 5 \times 1 0^{- 3} s; T = 20 \times 1 0^{- 3} s$
$v = \frac{1}{T} = \frac{1}{( 20 \times 1 0 ^{- 3} s )} = 50 Hz .$

Q. The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0ms when connected to an AC source. The frequency of the source is

20Hz

50Hz

200Hz

500Hz