In figure \( X \) is a closed box with two electric contacts. The box contains an inductance wit...

Channel:
PW Solutions
Subscribers:
453,000
Published on ● Video Link: https://www.youtube.com/watch?v=wzIWzqHC8JU


Duration: 6:28
0 views
0

In figure \( X \) is a closed box with two electric contacts. The box contains an inductance with resistance. The external resistance \( \mathrm{r}=1 \mathrm{ohm} \). For \( U=5 \mathrm{~V}(D C) \) the ammeter reads 1 A. For \( U=20 \mathrm{~V}(A C) \) at a frequency of \( 20 \mathrm{rad} / \mathrm{s} \) it reads \( 2 \mathrm{~A} \). What is there in the box? Assume that ammeter can read both \( A C \) and \( D C \).
(a) \( 4 \Omega \) and \( \frac{\sqrt{21}}{10} \mathrm{H} \)
(b) \( 5 \Omega \) and \( \frac{\sqrt{21}}{10} \mathrm{H} \)
(c) \( 4 \Omega \) and \( \frac{\sqrt{3}}{4} \mathrm{H} \)
(d) \( 5 \Omega \) and \( \frac{\sqrt{3}}{4} \mathrm{H} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2023-06-08A resistor of resistance \( R \), a capacitor of capacitance \( C \) and an inductor of inductan...
2023-06-08The value of \( \lim _{x \rightarrow 0} \frac{x^{2}-2 x}{2 \sin x} \) is (a) 1 (b) 2 (c) -1
2023-06-08\[ \lim _{x \rightarrow a} \frac{(x+2)^{5 / 3}-(a+2)^{5 / 3}}{x-a}= \] (a) \( \frac{5}{3}(a+2)^{...
2023-06-08\[ \lim _{x \rightarrow 1} \frac{\ln x}{x-1}= \] (a) 1 (b) -1 (c) 0 (d) \( \infty \)
2023-06-08If \( \lim _{x \rightarrow 0} \frac{\ln (3+x)-\ln (3-x)}{x}=k \), then the value of \( k \) is (...
2023-06-08The value of \( \lim _{x \rightarrow 0} \frac{a^{x}-b^{x}}{x} \) is (a) \( \log (a / b) \) (b) \...
2023-06-08Consider the following statements (where [.] denotes greatest integer function). \( \mathrm{S}_{...
2023-06-08If \( f(x)=\left\{\begin{array}{ll}x^{2}+1 & x \geq 1 \\ 3 x-1 & x1\end{array}\right. \) then th...
2023-06-08\[ \lim _{x \rightarrow 0} \frac{|x|}{x}= \] (a) 1 (b) -1 (c) 0 (d) Does not exist
2023-06-08A series RLC circuit is activated by a frequency \( (\omega) \) variable AC source of voltage \(...
2023-06-08In figure \( X \) is a closed box with two electric contacts. The box contains an inductance wit...
2023-06-08In a circuit \( L, C \) and \( R \) are connected in series with an alternating voltage source o...
2023-06-08In the figure shown hot wire voltmeter and hot wire ammeter are ideal. The reading of voltmeter ...
2023-06-08The reading of a ammeter in the circuit shown will be (a) \( 2 \mathrm{~A} \) (b) \( 2.4 \mathrm...
2023-06-08An inductor \( L \) and a capacitor \( C \) are connected in the circuit as shown in the figure....
2023-06-08In the circuit shown below, the AC source has voltage \( V=20 \cos (\omega t) \) volts with \( \...
2023-06-08A power transformer (step up) with an \( 1: 8 \) turn ratio has 60 \( \mathrm{Hz}, 120 \mathrm{~...
2023-06-08The given equivalent circuit is critically damped. Find the value of \( R_{1} \) in the given ci...
2023-06-08Calculate \( Q \)-factor (Quality factor) of a series \( L-C-R \) circuit containing a pure indu...
2023-06-08You have a parallel RLC circuit with \( 6 \mathrm{~A} \) through the resistor, 8 A through the i...
2023-06-08A series resonant LCR circuit has a quality factor ( \( Q \)-factor) \( =0.4 \). If \( \mathrm{R...