Inductors in Circuits
Trending Questions
Q. A coil of inductance 40 henry is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is
- 40 seconds
- 20 seconds
- 8 seconds
- 5 seconds
Q. Find VA−VB in steady state
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/934188/original_Q8.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/934188/original_Q8.png)
- 8 V
- 16 V
- 24 V
- Data is insufficient
Q. A portion of length π m is cut out of a conical solid wire. The two ends of this portion have circular cross-sections of radii r1=5 cm and r2=10 cm. It is connected lengthwise to a circuit and a current I=2A is flowing through it. The resistivity of the material of the wire is ρ=1.5×10−3 Ωm. Calculate the resistance R, of the considered portion and the voltage, V developed across it.
- R=0.3 Ω , V=0.6 volts
- R=0.6 Ω , V=0.6 volts
- R=0.6 Ω , V=0.3 volts
- R=3 Ω , V=6 volts
Q. An inductor L, a resistance R and two identical bulbs B1 and B2 are connected to a battery through a switch S as shown in the figure. The resistance of coil having inductance L is also R. Which of the following statement gives the correct description of the happenings, when the switch S is closed ?
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/918561/original_Q18.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/918561/original_Q18.png)
- The bulb B2 lights up earlier than B1 and finally both the bulbs shine equally bright.
- B1 light up earlier and finally both the bulbs acquire equal brightness.
- B2 lights up earlier and finally B1 shines brighter than B2.
- B1 and B2 light up together with equal brightness all the time.
Q. When the current in the portion of the circuit shown in the figure is 2 A and increasing at the rate of 1 A/s, the measured potential difference Vab=8 V. However when the current is 2 A and decreasing at the rate of 1 A/s, the measured potential difference Vab=4 V. The value of R and L are
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/934170/original_Q7.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/934170/original_Q7.png)
- 3 Ω and 2 H respectively
- 2 Ω and 3 H respectively
- 10 Ω and 6 H respectively
- 6 Ω and 1 H respectively.
Q. The switch in the circuit is closed at t=0. Find the current through the cell immediately after the switch is closed.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/918249/original_Q10.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/918249/original_Q10.png)
- 1 A
- 2 A
- 3 A
- 4 A
Q. A coil of resistance 20 Ω and inductance 5 H has been connected to a 100 V battery and the switch is closed at t=0. After how much time will the current acquire half of its steady state value. (ln2=0.693)
- 0.17 s
- 0.34 s
- 0.09 s
- 0.69 s
Q. More than One Answer Type
एक से अधिक उत्तर प्रकार के प्रश्न
For the shown circuit, choose the correct options. (Ammeter is ideal)
दर्शाए गए परिपथ के लिए, सही विकल्प/विकल्पों का चयन कीजिए। (अमीटर आदर्श है)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1457991/original_ANTHE2021SOE12PSJ17122021Himage008.jpg)
एक से अधिक उत्तर प्रकार के प्रश्न
For the shown circuit, choose the correct options. (Ammeter is ideal)
दर्शाए गए परिपथ के लिए, सही विकल्प/विकल्पों का चयन कीजिए। (अमीटर आदर्श है)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1457991/original_ANTHE2021SOE12PSJ17122021Himage008.jpg)
- Potential difference (VA – VB) is equal to 6 V
विभवान्तर (VA – VB) का मान 6 V है - Potential difference (VA – VB) is equal to 5413V
विभवान्तर (VA – VB) का मान 5413V है - Value of current I1 is 2 A
धारा I1 का मान 2 A है - Reading of ammeter is 6013A
अमीटर का पाठ्यांक 6013A है
Q. In an L−R circuit connected to a battery of constant e.m.f E, switch S is closed at time t = 0. If e denotes the magnitude of induced e.m.f across inductor and i the current in the circuit at any time t. Then which of the following graphs shows the variation of e with i ?
Q. The resistance in the following circuit is increased at a particular instant. At this instant the value of resistance is 10W. The current in the circuit will be now
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/17394/content_imageedit_16_6600438039.png)
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/17394/content_imageedit_16_6600438039.png)
- i = 0.5 A
- i > 0.5 A
- i < 0.5 A
- i = 0
Q. In an L−R circuit connected to a battery of constant e.m.f E, switch S is closed at time t = 0. If e denotes the magnitude of induced e.m.f across inductor and i the current in the circuit at any time t. Then which of the following graphs shows the variation of e with i ?
Q. An e.m.f. of 15 volt is applied in a circuit containing 5 henry inductance and 10 ohm resistance. The ratio of the currents at time t=∞ and at t =1 second is
- e12e12−1
- e2e2−1
- 1−e−1
- e−1
Q. A coil of resistance 20 Ω and inductance 5 H has been connected to a 100 V battery and the switch is closed at t=0. After how much time will the current acquire half of its steady state value. (ln2=0.693)
- 0.17 s
- 0.34 s
- 0.09 s
- 0.69 s
Q. The potential difference across a 2H inductor as a function of time is shown in the figure. At t=0, current is zero. Choose the correct statement(s).
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/616853/original_10.png)
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/616853/original_10.png)
- Current at t=2s is 5A
- Current at t=2s is 10A
- Current versus time graph across the inductor will be
- Current versus time graph across the inductor will be
Q. In series with 20 ohm resistor a 5 henry inductor is placed. To the combination an e.m.f. of 5 volt is applied. What will be the rate of increase of current at t = 0.25 sec
- e
- e−2
- e−1
- None of these
Q. Figure shows a circuit contains three identical resistors with resistance R=9.0Ωeach, two identical inductors with inductance, L = 2.0 mH each, and an ideal battery with emf ε=18 V. The current ′i′ through the battery just after the switch closed is
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/555206/original_get3.png)
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/555206/original_get3.png)
- 0.2 A
- 2 A
- 0 A
- 2 mA
Q. A current of 2A is passed through a coil of 1000 turns, to produce a flux of 0.5 weber. What is the self inductance of the coil?
- 100 H
- 250 H
- 300 H
- 50 H