MCQ
The back e.m.f. induced in a coil, when current changes from 1 ampere to zero in one milli‑second, is 4 volts, the self inductance of the coil is
- A1 H
- B4 H
- C$10^{-3}$ H
- ✓$4\times 10^{-3}$ H
✓
Answer
Correct option: D.
$4\times 10^{-3}$ H
(d) $4\times 10^{-3}$ H
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
The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is one. The thickness of the air column is $....\,{mm} .$ [Refractive index of air $=1.0003$, wavelength of yellow light in vacuum $=6000 \,\mathring {{A}}$ ]
→Figure shows a circuit that contains three identical resistors with resistance $R = 9.0 \,\,\Omega$ each, two identical inductors with inductance $L = 2.0\, mH$ each, and an ideal battery with $emf\,\, = 18 \,\,V.$ The current $i$ through the battery just after the switch closed is
→The colour of the positive column in a gas discharge tube depends on
A 60 watt bulb is hung over the center of a table $4 m \times 4 m$ at a height of 3 m . The ratio of the intensities of illumination at a point on the centre of the edge and on the corner of the table is
→When potential difference is applied across an electrolyte, then $Ohm's$ law is obeyed at:
→A film projector magnifies a $100\ cm^2$ film strip on a screen. If the linear magnification is $4,$ the area of magnified film on the screen is
→The largest distance between the interatomic planes of a crystal is $10^{-7}$ cm. The upper limit for the wavelength of $X-$ rays which can be usefully studied with this crystal is ............ $\mathop {\rm{A}}\limits^o $
→If the resistance of a conductor is $5\,\Omega\,\,$ at $\,50\,^oC$ and $7\, \Omega\,$ at $\,100\,^oC$ then the mean temperature coefficient of resistance of the material is ............... $^oC$
→Suppose a small cylinder of a paramagnetic sub stance and a small cylinder of a diamagnetic substance are placed between the (parallel) pole pieces of a strong magnet, so that they are aligned along the direction of the field lines . Will they attract or repel each other?
A wheatstone bridge is used to determine the value of unknown resistance $X$ by adjusting the variable resistance $Y$ as shown in the figure. For the most precise measurement of $X$, the resistances $P$ and $Q$:
→