MCQ
Impedance of L-R circuit is :
- A$R^{2}+\omega^{2}L^{2}$
- ✓$\sqrt{(R^{2}+\omega^{2}L^{2})}$
- C$R+\omega L$
- D$\sqrt{R+\omega L}$
✓
Answer
Correct option: B.
$\sqrt{(R^{2}+\omega^{2}L^{2})}$
B
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a diode AM-detector, the output circuit consist of R = 1kW and C = 10 pF. A carrier signal of 100 kHz is to be detected. Is it good
|
(a) Yes |
(b) No |
|
(c) Information is not sufficient |
(d) None of these |
When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is
|
(a) 1.0 V |
(b) 1.5 V |
(c) 2.0 V |
(d) 2.5 V |
In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be
|
(a) 0.5 mm |
(b) 1.0 mm |
(c) 1.2 mm |
(d) 1.5 mm |
An infinite number of identical capacitors each of capacitance 1 μF are connected as in adjoining figure. Then the equivalent capacitance between A and B is
|
(a) 1 μF |
(b) 2 μF |
(c) |
(d) ∞ |
Light of frequency n is incident on a certain photoelectric substance with threshold frequency n0. The work function for the substance is
|
(a) hn |
(b) hn0 |
(c) |
(d) |
A bar magnet of magnetic moment $m$ when kept in a maenetic field of intensity $\vec{B}$ experiences a torgue:
→The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
|
(a) 49o to the horizontal |
(b) 90o with the vertical |
|
(c) 49o to the vertical |
(d) Along the horizontal |
Which of the following is the radio-isotope?
$^{39}_{19}{\text{K}}$, $^{40}_{19}{\text{K}}$
→$^{39}_{19}{\text{K}}$, $^{40}_{19}{\text{K}}$
Which group among the following is insulator?
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
|
(a) Keep oscillating with the old time period |
|
(b) Keep oscillating with a smaller time period |
|
(c) Keep oscillating with a larger time period |
|
(d) Come to rest very soon |